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  • E-mailHakon.Gjessing@uib.no
  • Phone+47 21 07 82 41+47 975 22 262
  • Visitor Address
    Kalfarveien 31
  • Postal Address
    Postboks 7804
    5020 Bergen
Books
  • Aalen, Odd O.; Borgan, Ørnulf; Gjessing, Håkon K. 2008. Event history analysis: A process point of view. Springer Science+Business Media B.V.. 539 pages. ISBN: 978-0-387-20287-7.
  • Aalen, Odd O.; Borgan, Ørnulf; Gjessing, Håkon K. 2008. Survival and event history analysis: a process point of view. Springer Science+Business Media B.V.. 539 pages. ISBN: 978-0-387-20287-7.
  • Aalen, Odd O.; Borgan, Ørnulf; Gjessing, Håkon K. 2008. Survival and Event History Analysis: A Process Point of View. Springer. 539 pages. ISBN: 978-0-387-20287-7.
Journal articles
  • Gjerdevik, Miriam; Jugessur, Astanand; Haaland, Øystein Ariansen; Romanowska, Julia; Lie, Rolv T.; Cordell, Heather J.; Gjessing, Håkon K. 2019. Haplin power analysis: a software module for power and sample size calculations in genetic association analyses of family triads and unrelated controls. BMC Bioinformatics. 20. 11 pages. doi: 10.1186/s12859-019-2727-3
  • Gjessing, Håkon K.; Skaug, Hans J. 2019. Editorial. Scandinavian Journal of Statistics. 46: 1-1. doi: 10.1111/sjos.12386
  • Grønning Dale, Maria Teresa; Magnus, Per; Leirgul, Elisabeth; Holmstrøm, Henrik; Gjessing, Håkon K.; Brodwall, Kristoffer; Haugen, Margaretha; Stoltenberg, Camilla; Øyen, Nina. 2019. Intake of sucrose‑sweetened soft beverages during pregnancy and risk of congenital heart defects (CHD) in offspring: A Norwegian pregnancy cohort study. European Journal of Epidemiology. 34: 383-396. doi: 10.1007/s10654-019-00480-y
  • Kinge, Jonas Minet; Modalsli, Jørgen Heibø; Øverland, Simon Nygaard; Gjessing, Håkon K.; Tollånes, Mette Christophersen; Knudsen, Ann Kristin; Skirbekk, Vegard Fykse; Strand, Bjørn Heine; Håberg, Siri Eldevik; Vollset, Stein Emil. 2019. Association of Household Income with Life Expectancy and Cause-Specific Mortality in Norway, 2005-2015. Journal of the American Medical Association (JAMA). 321: 1916-1925. doi: 10.1001/jama.2019.4329
  • Lee, Yunsung; Choufani, Sanaa; Weksberg, Rosanna; Wilson, Samantha L.; Yuan, Victor; Burt, Amber; Marsit, Carmen; Lu, Ake T.; Ritz, Beate; Bohlin, Jon; Gjessing, Håkon K.; Harris, Jennifer Ruth; Magnus, Per; Binder, Alexandra M.; Robinson, Wendy P.; Jugessur, Astanand; Horvath, Steve. 2019. Placental epigenetic clocks: estimating gestational age using placental DNA methylation levels. Aging. 11: 4238-4253. doi: 10.18632/aging.102049
  • Haaland, Øystein Ariansen; Lie, Rolv T.; Romanowska, Julia; Gjerdevik, Miriam; Gjessing, Håkon K.; Jugessur, Astanand. 2018. A genome-wide search for gene-environment effects in isolated cleft lip with or without cleft palate triads points to an interaction between maternal periconceptional vitamin use and variants in ESRRG. Frontiers in Genetics. 9. 16 pages. doi: 10.3389/fgene.2018.00060
  • Skare, Øivind; Lie, Rolv T.; Haaland, Øystein Ariansen; Gjerdevik, Miriam; Romanowska, Julia; Gjessing, Håkon K.; Jugessur, Astanand. 2018. Analysis of parent-of-origin effects on the X chromosome in asian and european orofacial cleft triads identifies associations with DMD, FGF13, EGFL6, and additional loci at Xp22.2. Frontiers in Genetics. 9. 17 pages. doi: 10.3389/fgene.2018.00025
  • Clark, Michelle M.; Chazara, Olympe; Sobel, Eric M.; Gjessing, Håkon K.; Magnus, Per; Moffett, Ashley; Sinsheimer, Janet S. 2017. Human birth weight and reproductive immunology: testing for interactions between maternal and offspring KIR and HLA-C genes. Human Heredity. 81: 181-193. doi: 10.1159/000456033
  • Gjerdevik, Miriam; Haaland, Øystein Ariansen; Romanowska, Julia; Lie, Rolv T.; Jugessur, Astanand; Gjessing, Håkon K. 2017. Parent-of-origin-environment interactions in case-parent triads with or without independent controls. Annals of Human Genetics. 82: 60-73. doi: 10.1111/ahg.12224
  • Gjessing, Håkon K. 2017. Svangerskapsdatering. Norsk Epidemiologi. 27: 13-18. doi: 10.5324/nje.v27i1-2.2397
  • Haaland, Øystein Ariansen; Jugessur, Astanand; Gjerdevik, Miriam; Romanowska, Julia; Shi, Min; Beaty, Terri H.; Marazita, Mary L.; Murray, Jeffrey C.; Wilcox, Allen J.; Lie, Rolv T.; Gjessing, Håkon K. 2017. Genome-wide analysis of parent-of-origin interaction effects with environmental exposure (PoOxE): An application to European and Asian cleft palate trios. PLoS ONE. 12. 19 pages. doi: 10.1371/journal.pone.0184358
  • McGinnis, Ralph; Steinthorsdottir, Valgerdur; Williams, Nicholas O.; Thorleifsson, Gudmar; Shooter, Scott; Hjartardóttir, Sigrún; Bumpstead, Suzannah; Stefánsdóttir, Lilja; Hildyard, Lucy; Sigurdsson, Jon K.; Kemp, John P.; Silva, Gabriela; Thomsen, Liv Cecilie Vestrheim; Jääskeläinen, Tiina; Kajantie, Eero; Chappell, Sally; Kalsheker, Noor; Moffett, Ashley; Hiby, Susan; Lee, Wai Kwong; Padmanabhan, Sandosh; Simpson, Nigel A.B.; Dolby, Vivien A.; Staines-Urias, Eleonora; Engel, Stephanie M.; Haugan, Anita; Trogstad, Lill; Svyatova, Gulnara; Zakhidova, Nodira; Najmutdinova, Dilbar; Dominiczak, Anna F.; Gjessing, Håkon K.; Casas, Juan P.; Dudbridge, Frank; Walker, James J.; Pipkin, Fiona Broughton; Thorsteinsdóttir, Unnur; Geirsson, Reynir Tõmas; Lawlor, Debbie A.; Iversen, Ann-Charlotte; Magnus, Per; Laivuori, Hannele; Stefánsson, Kári; Morgan, Linda. 2017. Variants in the fetal genome near FLT1 are associated with risk of preeclampsia. Nature Genetics. 49: 1255-1260. doi: 10.1038/ng.3895
  • Pay, Aase Serine Devold; Frøen, Frederik; Staff, Anne Cathrine; Jacobsson, Bo; Gjessing, Håkon K. 2017. Symfyse-fundus-mål – prediktiv verdi av ny referansekurve. Tidsskrift for Den norske legeforening. 137: 717-720. doi: 10.4045/tidsskr.16.1022
  • Skare, Øivind; Gjessing, Håkon K.; Gjerdevik, Miriam; Haaland, Øystein Ariansen; Romanowska, Julia; Lie, Rolv T.; Jugessur, Astanand. 2017. A new approach to chromosome-wide analysis of X-linked markers identifies new associations in Asian and European case-parent triads of orofacial clefts. PLoS ONE. 12. 23 pages. doi: 10.1371/journal.pone.0183772
  • Uribe, L M Moreno; Fomina, Tatiana; Munger, R G; Romitti, P A; Jenkins, M M; Gjessing, Håkon K.; Gjerdevik, Miriam; Christensen, Kaare; Wilcox, Allen James; Murray, Jeffrey C.; Lie, Rolv T.; Wehby, G L. 2017. A Population-Based Study of Effects of Genetic Loci on Orofacial Clefts. Journal of Dental Research. 96: 1322-1329. doi: 10.1177/0022034517716914
  • Andersen, Gidske Leknæs; Krzywinski, Knut; Gjessing, Håkon K.; Pierce, Richard. 2016. Seed viability and germination success of Acacia tortilis along land-use and aridity gradients in the Eastern Sahara. Ecology and Evolution. 6: 256-266. doi: 10.1002/ece3.1851
  • Bohlin, Jon; Håberg, Siri Eldevik; Magnus, Per; Reese, Sarah E; Gjessing, Håkon K.; Magnus, Maria Christine; Parr, Christine Louise; Page, Christian; London, Stephanie J; Nystad, Wenche. 2016. Prediction of gestational age based on genome-wide differentially methylated regions. Genome Biology. 17. 9 pages. doi: 10.1186/s13059-016-1063-4
  • Eggebø, Torbjørn Moe; Klefstad, Olav-Andre; Økland, Inger; Gjessing, Håkon K. 2016. Prenatal detection of macrosomia in pregnancies past term. Ultrasound in Obstetrics and Gynecology.
  • Eggebø, Torbjørn Moe; Klefstad, Olav-Andre; Økland, Inger; Gjessing, Håkon K. 2016. Estimation of fetal weight in pregnancies past term. Ultrasound in Obstetrics and Gynecology.
  • Eggebø, Torbjørn Moe; Klefstad, Olav-Andre; Økland, Inger; Gjessing, Håkon K. 2016. Prenatal detection of low birthweight in pregnancies past term. Ultrasound in Obstetrics and Gynecology.
  • Eggebø, Torbjørn Moe; Klefstad, Olav-Andre; Økland, Inger; Lindtjørn, Elsa; Eik-Nes, Sturla; Gjessing, Håkon K. 2016. Estimation of fetal weight in pregnancies past term. Acta Obstetricia et Gynecologica Scandinavica. 96: 183-189. doi: 10.1111/aogs.13044
  • Gjessing, Håkon K.; Grøttum, Per; Økland, Inger; Eik-Nes, Sturla. 2016. Fetal size monitoring and birth-weight prediction: a new population-based approach. Ultrasound in Obstetrics and Gynecology. 49: 500-507. doi: 10.1002/uog.15954
  • Pay, Aase Serine Devold; Frøen, Frederik; Staff, Anne Cathrine; Jacobsson, Bo; Gjessing, Håkon K. 2016. Prediction of small-for-gestational-age status by symphysis–fundus height: a registry-based population cohort study. BJOG: an International Journal of Obstetrics and Gynaecology. 123: 1167-1173. doi: 10.1111/1471-0528.13727
  • Witsø, Elisabet; Cinek, Ondrej; Tapia, German; Brorsson, Caroline A.; Stene, Lars Christian; Gjessing, Håkon K.; Rasmussen, Trond; Bergholdt, Regine; Pociot, Flemming M; Rønningen, Kjersti Skjold. 2015. Genetic determinants of enterovirus infections: Polymorphisms in type 1 diabetes and innate immune genes in the MIDIA study. Viral immunology. 28: 556-563. doi: 10.1089/vim.2015.0067
  • Farrel, Lydia E.; Hiby, Susan E.; Apps, Richard; Chazara, Olympe; Trogstad, Lill; Gjessing, Håkon K.; Magnus, Per; Carrington, Mary; Moffett, Ashley. 2014. KIR and HLA-C: Immunogenetic regulation of human birth weight. Norsk Epidemiologi. 24: 107-110.
  • Hiby, SE; Apps, R; Chazara, O; Farrell, LE; Magnus, Per; Trogstad, Lill; Gjessing, Håkon K.; Carrington, M; Moffett, A. 2014. Maternal KIR in combination with paternal HLA-C2 regulate human birth weight. Journal of Immunology. 192: 5069-5073. doi: 10.4049/jimmunol.1400577
  • Hjellvik, Vidar; Selmer, Randi; Gjessing, Håkon K.; Tverdal, Aage; Vollset, Stein Emil. 2013. Body mass index, smoking, and risk of death between 40 and 70 years of age in a Norwegian cohort of 32,727 women and 33,475 men. European Journal of Epidemiology. 28: 35-43. doi: 10.1007/s10654-012-9758-7
  • Håberg, Siri Eldevik; Trogstad, Lill; Gunnes, Nina; Wilcox, AJ; Gjessing, Håkon K.; Samuelsen, Sven Ove; Skrondal, Anders; Cappelen, Inger; Engeland, Anders; Aavitsland, Preben; Madsen, Steinar; Buajordet, I; Furu, Kari; Nafstad, Per; Vollset, Stein Emil; Feiring, Berit; Nøkleby, Hanne; Magnus, Per; Stoltenberg, Camilla. 2013. Risk of Fetal Death after Pandemic Influenza Virus Infection or Vaccination. New England Journal of Medicine. 368: 333-340. doi: 10.1056/NEJMoa1207210
  • Håberg, Siri Eldevik; Trogstad, Lill; Gunnes, Nina; Wilcox, Allen J; Gjessing, Håkon K.; Samuelsen, Sven Ove; Skrondal, Anders; Cappelen, Inger; Engeland, Anders; Aavitsland, Preben; Madsen, Steinar; Buajordet, Ingebjørg; Furu, Kari; Nafstad, Per; Vollset, Stein Emil; Feiring, Berit; Nøkleby, Hanne; Magnus, Per; Stoltenberg, Camilla. 2013. Risk of Fetal Death After Pandemic Influenza Virus Infection or Vaccination EDITORIAL COMMENT. Obstetrical and Gynecological Survey. 68: 348-349. doi: 10.1097/01.ogx.0000430377.29993.2b
  • Myking, Solveig; Boyd, Heather A; Myhre, Ronny; Feenstra, Bjarke; Jugessur, Astanand; Pay, Aase Serine Devold; Østensen, Ingrid Helene Garmann; Morken, Nils-Halvdan; Busch, Tamara; Ryckman, Kelli K; Geller, Frank; Magnus, Per; Gjessing, Håkon K; Melbye, Mads; Jacobsson, Bo; Murray, Jeffrey C. 2013. X-chromosomal maternal and fetal SNPs and the risk of spontaneous preterm delivery in a Danish/Norwegian genome-wide association study. PLoS ONE. 8. 11 pages. doi: 10.1371/journal.pone.0061781
  • Pay, Aase Serine Devold; Frøen, Frederik; Staff, Anne Cathrine; Jacobsson, Bo; Gjessing, Håkon K. 2013. A new population-based reference curve for symphysis-fundus height. Acta Obstetricia et Gynecologica Scandinavica. 92: 925-933. doi: 10.1111/aogs.12157
  • Rietveld, Cornelius A.; Medland, SE; Derringer, J; Yang, J; Esko, T; Martin, NW; Westra, HJ; Shakhbazov, K; Abdellaoui, A; Agrawal, A; Albrecht, E; Alizadeh, BZ; Amin, N; Bamard, J; Baumeister, SE; Benke, KS; Bielak, LF; Boatman, JA; Boyle, PA; Davies, G; De Leeuw, C; Eklund, N; Evans, DS; Ferhmann, R; Fischer, K; Gieger, C; Gjessing, Håkon K.; Hagg, S; Harris, Jennifer; Hayward, C; Holzapfel, C; Ibrahim-Verbaas, CA; Ingelsson, E; Jacobsson, Bo; Joshi, PK; Jugessur, Astanand; Kaakinen, M; Kanoni, S; Karjalainen, J; Kolcic, I; Kristiansson, K; Kutalik, Z; Lahti, J; Lee, SH; Lin, P; Lind, PA; Liu, YM; Lohman, K; Loitfelder, M; McMahon, G; Vidal, PM; Meirelles, O; Milani, L; Myhre, Ronny; Nuotio, ML; Oldmeadow, CJ; Petrovic, KE; Peyrot, WJ; Polasek, O; Quaye, L; Reinmaa, E; Rice, JP; Rizzi, TS; Schmidt, H; Schmidt, R; Smith, AV; Smith, JA; Tanaka, T; Terracciano, A; van der Loos, MJHM; Vitart, V; Volzke, H; Wellmann, J; Yu, L; Zhao, W; Allik, J; Attia, JR; Bandinelli, S; Bastardot, F; Beauchamp, J; Bennett, DA; Berger, K; Bierut, LJ; Boomsma, DI; Bultmann, U; Campbell, H; Chabris, CF; Cherkas, L; Chung, MK; Cucca, F; de Andrade, M; De Jager, PL; De Neve, JE; Deary, IJ; Dedoussis, GV; Deloukas, P; Dimitriou, M; Eiriksdottir, G; Elderson, MF; Eriksson, JG; Evans, DM; Faul, JD; Ferrucci, L; Garcia, ME; Gronberg, H; Guonason, V; Hall, P; Harris, JM; Harris, TB; Hastie, ND; Heath, AC; Hernandez, DG; Hoffmann, W; Hofman, A; Holle, R; Holliday, EG; Hottenga, JJ; Iacono, WG; Illig, T; Jarvelin, MR; Kahonen, M; Kaprio, J; Kirkpatrick, RM; Kowgier, M; Latvala, A; Launer, LJ; Lawlor, DA; Lehtimaki, T; Li, JM; Lichtenstein, P; Lichtner, P; Liewald, DC; Madden, PA; Magnusson, PKE; Makinen, TE; Masala, M; McGue, M; Metspalu, A; Mielck, A; Miller, MB; Montgomery, GW; Mukherjee, S; Nyholt, DR; Oostra, BA; Palmer, LJ; Palotie, A; Penninx, BWJH; Perola, M; Peyser, PA; Preisig, M; Raikkonen, K; Raitakari, OT; Realo, A; Ring, SM; Ripatti, S; Rivadeneira, F; Rudan, I; Rustichini, A; Salomaa, V; Sarin, AP; Schlessinger, D; Scott, RJ; Snieder, H; St Pourcain, B; Starr, JM; Sul, JH; Surakka, I; Svento, R; Teumer, A; Tiemeier, H; van Rooij, FJA; Van Wagoner, DR; Vartiainen, E; Viikari, J; Vollenweider, P; Vonk, JM; Waeber, G; Weir, DR; Wichmann, HE; Widen, E; Willemsen, G; Wilson, JF; Wright, AF; Conley, D; Davey-Smith, G; Franke, L; Groenen, PJF; Johannesson, M; Kardia, SLR; Krueger, RF; Laibson, D; Martin, NG; Meyer, MN; Posthuma, D; Thurik, AR; Timpson, NJ; Uitterlinden, AG; van Duijn, CM; Visscher, PM; Benjamin, Daniel J.; Cesarini, David; Koellinger, Philipp D. 2013. GWAS of 126,559 Individuals Identifies Genetic Variants Associated with Educational Attainment. Science. 340: 1467-1471. doi: 10.1126/science.1235488
  • Håberg, Siri Eldevik; Trogstad, Lill; Gunnes, Nina; Gjessing, Håkon K.; Samuelsen, Sven Ove; Cappelen, Inger; Engeland, Anders; Aavitsland, Preben; Madsen, Steinar; Buajordet, Ingebjørg; Furu, Kari; Nafstad, Per; Vollset, Stein Emil; Feiring, Berit; Nøkleby, Hanne; Magnus, Per; Stoltenberg, Camilla. 2012. The 2009 Influenza Pandemic, Vaccination during Pregnancy and Fetal Death: A National Registry-Based Study in Norway. Pharmacoepidemiology and Drug Safety. 21: 382-382.
  • Igland, Jannicke; Vollset, Stein Emil; Nygård, Ottar; Gjessing, Håkon K.; Ueland, Per Magne; Tell, Grethe S. 2012. Relative importance of risk factors for coronary heart disease - The Hordaland Homocysteine Study. Scandinavian Cardiovascular Journal. 46: 316-323. doi: 10.3109/14017431.2012.720024
  • Jacobsson, Bo; Brantsæter, Anne Lise; Gjessing, Håkon; Myking, Solveig; Meltzer, Helle Margrete; Haugen, Margaretha; Myhre, Ronny. 2012. Intake of food with antimicrobial diet components and risk of spontaneous preterm delivery. American Journal of Obstetrics and Gynecology. 206: S213-S213. doi: 10.1016/j.ajog.2011.10.483
  • Jacobsson, Bo; Skare, Øivind; Sengpiel, Verena; Myking, Solveig; Østensen, Ingrid Helene Garmann; Brantsæter, Anne Lise; Haugen, Margaretha; Meltzer, Helle Margrete; Magnus, Per; Gjessing, Håkon; Myhre, Ronny. 2012. Genetic variants in gene-environment interaction analysis of probiotic intake in spontaneous preterm delivery. American Journal of Obstetrics and Gynecology. 206: S212-S212.
  • Jugessur, Astanand; Gjessing, Håkon K.; Wilcox, Allen J; Nguyen, Trung-Truc; Nilsen, Roy Miodini; Murray, Jeffrey C; Lie, Rolv T. 2012. Assessing the impact of nicotine dependence genes on the risk of facial clefts: An example of the use of national registry and biobank data. Norsk Epidemiologi. 21: 241-250.
  • Jugessur, Astanand; Skare, Øivind; Harris, Jennifer; Lie, Rolv T.; Gjessing, Håkon K. 2012. Using offspring-parent triads to study complex traits : a tutorial based on orofacial clefts. Norsk Epidemiologi. 21: 251-267.
  • Jugessur, Astanand; Skare, Øivind; Lie, Rolv T.; Wilcox, Allen J; Christensen, Kaare; Christiansen, Lene; Nguyen, Trung-Truc; Murray, Jeffrey C; Gjessing, Håkon. 2012. X-Linked Genes and Risk of Orofacial Clefts: Evidence from Two Population-Based Studies in Scandinavia. PLoS ONE. 7. doi: 10.1371/journal.pone.0039240
  • Nilsen, Roy Miodini; Monsen, Anne Lise Bjørke; Midttun, Øivind; Nygård, Ottar; Pedersen, Eva Kristine Ringdal; Ulvik, Arve; Magnus, Per; Gjessing, Håkon; Vollset, Stein Emil; Ueland, Per Magne. 2012. Maternal tryptophan and kynurenine pathway metabolites and risk of preeclampsia. Obstetrics and Gynecology. 119: 1243-1250. doi: 10.1097/AOG.0b013e318255004e
  • Pay, Aase Serine Devold; Gjessing, Håkon K.; Staff, Anne Cathrine; Jacobsson, Bo; Frøen, Frederik. 2012. A population-based reference chart for fundal height measures. Acta Obstetricia et Gynecologica Scandinavica. 91: 117-118.
  • Skare, Øivind; Jugessur, Astanand; Lie, Rolv T.; Wilcox, Allen J; Murray, Jeffrey C; Lunde, Astrid; Nguyen, Trung-Truc; Gjessing, Håkon K. 2012. Application of a Novel Hybrid Study Design to Explore Gene-Environment Interactions in Orofacial Clefts. Annals of Human Genetics. 76: 221-236. doi: 10.1111/j.1469-1809.2012.00707.x
  • Sommerfelt, Halvor; Steinsland, Hans; van der Merwe, Lize; Blackwelder, William C.; Nasrin, Dilruba; Faraq, Tamer H.; Kotloff, Karen L.; Levine, Myron M.; Gjessing, Håkon K. 2012. Case/Control studies with follow-up: constructing the source population to estimate effects of risk factors on development, disease, and survival. Clinical Infectious Diseases. 55: s262-s270. doi: 10.1093/cid/cis802
  • Strand, Tor A; Sharma, Pushpa R; Gjessing, Håkon K.; Ulak, Manjeswori; Chandyo, Ram Krishna; Adhikari, Ramesh K; Sommerfelt, Halvor. 2012. Risk factors for extended duration of acute diarrhea in young children. PLoS ONE. 7. doi: 10.1371/journal.pone.0036436
  • Økland, Inger; Gjessing, Håkon K.; Grøttum, Per; Eik-Nes, Sturla. 2012. OP32.01: The importance of standardizing pregnancy dating models. Ultrasound in Obstetrics and Gynecology. 40: 151-152. doi: 10.1002/uog.11699
  • Økland, Inger; Nakling, Ole Jakob; Gjessing, Håkon K.; Grøttum, Per; Eik-Nes, Sturla. 2012. Advantages of the population-based approach to pregnancy dating: results from 23 020 ultrasound examinations. Ultrasound in Obstetrics and Gynecology. 39: 563-568. doi: 10.1002/uog.10081
  • Økland, Ingrid; Gjessing, Håkon K.; Grøttum, Per; Eik-Nes, Sturla. 2012. Advantages of the population-based approch to pregnancy dating demonstrated with results from 73,400 second-trimester ultrasound examinations. Acta Obstetricia et Gynecologica Scandinavica. 91: 116-117.
  • Gervin, Kristina; Hammerø, Martin; Akselsen, Hanne Elisabeth; Moe, Rune; Nygård, Heidi; Brandt, Ingunn; Gjessing, Håkon; Harris, Jennifer; Undlien, Dag Erik; Lyle, Robert. 2011. Extensive variation and low heritability of DNA methylation identified in a twin study. Genome Research. 21: 1813-1821. doi: 10.1101/gr.119685.110
  • Jugessur, Astanand; Shi, Min; Gjessing, Håkon; Lie, Rolv T.; Wilcox, Allen James; Weinberg, Clarice Ring; Christensen, Kaare; Boyles, Abee Lowman; Daack-Hirsch, Sandra; Nguyen, Trung-Truc; Christiansen, Lene; Lidral, Andrew Carl; Murray, Jeffrey Clark. 2011. Fetal genetic risk of isolated cleft lip only versus isolated cleft lip and palate: a subphenotype analysis using two population-based studies of orofacial clefts in Scandinavia. Birth defects research. Clinical and molecular teratology. 91: 85-92. doi: 10.1002/bdra.20747
  • Moger, Tron Anders; Haugen, Marion; Yip, Benjamin H. K.; Gjessing, Håkon; Borgan, Ørnulf. 2011. A hierarchical frailty model applied to two-generation melanoma data. Lifetime Data Analysis. 17: 445-460. doi: 10.1007/s10985-010-9188-3
  • Myhre, Ronny; Brantsæter, Anne Lise; Myking, Solveig; Gjessing, Håkon; Sengpiel, Verena; Meltzer, Helle Margrete; Haugen, Margaretha; Jacobsson, Bo Gunnar. 2011. Intake of probiotic food and risk of spontaneous preterm delivery. American Journal of Clinical Nutrition. 93: 151-157. doi: 10.3945/ajcn.110.004085
  • Myking, Solveig; Myhre, Ronny; Gjessing, Håkon; Morken, Nils-halvdan; Sengpiel, Verena; Williams, Scott; Ryckman, Kelli K; Magnus, Per; Jacobsson, Bo. 2011. Candidate gene analysis of spontaneous preterm delivery: New insights from re-analysis of a case-control study using case-parent triads and control-mother dyads. BMC Medical Genetics. 12. doi: 10.1186/1471-2350-12-174
  • Økland, Inger; Bjåstad, Tore; Johansen, Tonni Franke; Gjessing, Håkon; Grøttum, Per; Eik-Nes, Sturla. 2011. Narrowed beam width in newer ultrasound machines shortens measurements in the lateral direction: fetal measurement charts may be obsolete. Ultrasound in Obstetrics and Gynecology. 38: 82-87. doi: 10.1002/uog.8954
  • Økland, Inger; Gjessing, Håkon; Grøttum, Per; Eggebø, Torbjørn Moe; Eik-Nes, Sturla. 2011. A new population-based term prediction model vs. two traditional sample-based models: validation on 9046 ultrasound examinations. Ultrasound in Obstetrics and Gynecology. 37: 207-213. doi: 10.1002/uog.7728
  • Gjessing, Håkon K.; Grøttum, Per; Økland, Inger; Eik-Nes, Sturla. 2010. Comment and reply on: Prediction of the date of delivery based on first trimester ultrasound measurements: an independent method from estimated date of conception. Journal of Maternal-Fetal & Neonatal Medicine. 23: 944-946. doi: 10.3109/14767050903420309
  • Gjessing, Håkon K.; Røysland, Kjetil; Aalen, Odd O.; Pena, Edsel A. 2010. Recurrent events and the exploding Cox model. Lifetime Data Analysis. 16: 525-546. doi: 10.1007/s10985-010-9180-y
  • Jugessur, Astanand; Shi, Min; Gjessing, Håkon K.; Lie, Rolv Terje; Wilcox, Allen James; Weinberg, Clarice Ring; Christensen, Kaare; Boyles, Abee Lowman; Daack-Hirsch, Sandra; Nguyen, Trung-Truc; Christiansen, Lene; Lidral, Andrew Carl; Murray, Jeffrey Clark. 2010. Maternal genes and facial clefts in offspring: a comprehensive search for genetic associations in two population-based cleft studies from Scandinavia. PLoS ONE. 5. doi: 10.1371/journal.pone.0011493
  • Vefring, Hege; Wee, Line L.; Jugessur, Astanand; Gjessing, Håkon K.; Nilsen, Stein Tore; Lie, Rolv T. 2010. Maternal angiotensinogen (AGT) haplotypes, fetal renin (REN) haplotypes and risk of preeclampsia; estimation of gene-gene interaction from family-triad data. BMC Medical Genetics. 11. 7 pages. doi: 10.1186/1471-2350-11-90
  • Økland, Inger; Gjessing, Håkon; Grøttum, Per; Eik-Nes, Sturla. 2010. Biases of traditional term prediction models: results from different sample-based models evaluated on 41 343 ultrasound examinations. Ultrasound in Obstetrics and Gynecology. 36: 728-734. doi: 10.1002/uog.7707
  • Boyles, Abee L.; Wilcox, Allen J.; Taylor, Jack A.; Shi, Min; Weinberg, Clarice R.; Meyer, Klaus; Meye, K; Fredriksen, Åse; Fredriksen, A; Ueland, Per Magne; Johansen, Anne Marte W.; Drevon, Christian A; Juggessur, Astanand; Jugessur, A; Trung, TN; Nguyen, Truc Trung; Gjessing, Håkon K; Vollset, Stein Emil; Murray, Jeffrey C.; Christensens, K; Christensen, Kaare; Lie, Rolv T. 2009. Oral facial clefts and gene polymorphisms in metabolism of folate/one-carbon and vitamin A: a pathway-wide association study. Genetic Epidemiology. 33: 247-255. doi: 10.1002/gepi.20376
  • Gjessing, Håkon K; Grøttum, Per; Økland, Inger; Eik-Nes, Sturla H. 2009. Comment and reply on: Prediction of the date of delivery based on first trimester ultrasound measurements: an independent method from estimated date of conception. Journal of Maternal-Fetal & Neonatal Medicine. doi: 10.3109/14767050903420309
  • Jugessur, Astanand; Shi, Min; Gjessing, Håkon K; Lie, Rolv T.; Wilcox, Allen J; Weinberg, Clarice R; Christensen, Kaare; Boyles, Abee L; Daack-Hirsch, Sandra; Nguyen, Truc Trung; Bille, Camille; Lidral, Andrew Carl; Murray, Jeffrey Clark. 2009. Genetic determinants of facial clefting: analysis of 357 candidate genes using two national cleft studies from Scandinavia. PLoS ONE. 4. doi: 10.1371/journal.pone.0005385
  • Magnus, Per; Brubakk, Oddbjørn; Brubakk, Oddbjørn; Nyland, Harald Inge; Nyland, Harald; Wold, Borgny Hedvig; Gjessing, Håkon K.; Brandt, Ingunn; Eidem, Tove; Eidem, Tove; Nøkleby, Hanne; Stene-Larsen, Geir. 2009. Vaccination as teenagers against meningococcal disease and the risk of the chronic fatigue syndrome. Vaccine. 27: 23-27. doi: 10.1016/j.vaccine.2008.10.043
  • Nilsen, Roy M; Vollset, Stein Emil; Gjessing, Håkon K.; Skjærven, Rolv; Klungsøyr, Kari; Schreuder, Patricia; Alsaker, Elin Hilde Roti; Haug, Kjell; Daltveit, Anne Kjersti Nesje; Magnus, Per. 2009. Self-selection and bias in a large prospective pregnancy cohort in Norway. Paediatric and Perinatal Epidemiology. 23: 597-608. doi: 10.1111/j.1365-3016.2009.01062.x
  • Gjessing, Håkon K.; Lie, Rolv Terje. 2008. Biometrical modelling in genetics: are complex traits too complex? Statistical Methods in Medical Research. 17: 75-96. doi: 10.1177/0962280207081241
  • Gjessing, Håkon K; Grøttum, Per; Eik-Nes, Sturla H. 2008. Re: A direct method for ultrasound prediction of day of delivery: a new, population-based approach. Problems of accounting for a retrospective selection - Reply. Ultrasound in Obstetrics and Gynecology. 31: 225-227.
  • Jugessur, Astanand; Rahimov, Fedik; Lie, Rolv Terje; Wilcox, Allen J; Gjessing, Håkon K.; Nilsen, Roy M; Nguyen, Trung-Truc; Murray, Jeffrey C. 2008. Genetic variants in IRF6 and the risk of facial clefts: Single-marker and haplotype-based analyses in a population-based case-control study of facial clefts in Norway. Genetic Epidemiology. 32: 413-424. doi: 10.1002/gepi.20314
  • Lie, Rolv Terje; Wilcox, Allen J; Taylor, Jack; Gjessing, Håkon K.; Saugstad, Ola Didrik; Aabyholm, Frank; Vindenes, Halvard. 2008. Maternal smoking and oral clefts - The role of detoxification pathway genes. Epidemiology. 19: 606-615. doi: 10.1097/EDE.0b013e3181690731
  • Rabe-Hesketh, Sophia; Skrondal, Anders; Gjessing, Håkon K. 2008. Biometrical modeling of twin and family data using standard mixed model software. Biometrics. 64: 280-288. doi: 10.1111/j.1541-0420.2007.00803.x
  • Eik-Nes, Sturla; Blaas, HG; Grøttum, Per; Gjessing, Håkon K. 2007. Predicting remaining time of pregnancy - a new population-based approach for the prediction of day of delivery based on Femur length. Ultrasound in Obstetrics and Gynecology. 30: 478-478. doi: 10.1002/uog.4467
  • Gjessing, Håkon K.; Grøttum, Per. 2007. Accuracy of second trimester fetal head circumference and biparietal diameter for predicting the time of spontaneous birth. Journal of Perinatal Medicine. 35: 350-351. doi: 10.1515/JPM.2007.080
  • Gjessing, Håkon K.; Grøttum, Per; Grottum, P; Eik-Nes, Sturla. 2007. A direct method for ultrasound prediction of day of delivery: a new, population-based approach. Ultrasound in Obstetrics and Gynecology. 30: 19-27. doi: 10.1002/uog.4053
  • Li, Huiling; Romieu, Isabelle; Wu, Hao; Sienra-Monge, Juan Jose; Ramirez-Aguilar, Matiana; del Rio-Navarro, Blanca Estela; del Lara-Sanchez, Irma Carmen; Kistner, Emily O; Gjessing, Håkon K.; London, Stephanie J. 2007. Genetic polymorphisms in transforming growth factor beta-1 (TGFB1) and childhood asthma and atopy. Human Genetics. 121: 529-538. doi: 10.1007/s00439-007-0337-z
  • Lie, Rolv T.; Gjessing, Håkon K; Taylor, Jack; Wilcox, Allen J. 2007. Haplotype relative risk estimation in epidemiological studies; New methodology applied to a study of smoking, relevant detoxification genes and oral clefts in Norway. American Journal of Epidemiology. 165: S142-S142.
  • Lie, Rolv Terje; Gjessing, Håkon K.; Taylor, J; Wilcox, AJ. 2007. Haplotype relative risk estimation in epidemiological studies; New methodology applied to a study of smoking, relevant detoxification genes and oral clefts in Norway. American Journal of Epidemiology. 165: S142. doi: 10.1093/aje/kwm163
  • Lunde, Astrid; Klungsøyr Melve, Kari; Gjessing, Håkon K.; Skjærven, Rolv; Irgens, Lorentz M. 2007. Genetic and environmental influences on birth weight, birth length, head circumference and gestational age using population based parent-offspring data. American Journal of Epidemiology. 165: 734-741. doi: 10.1093/aje/kwk107
  • Strand, Tor A; Taneja, Sunita; Bhandari, Nita; Refsum, Helga; Ueland, Per Magne; Gjessing, Håkon K.; Bahl, Rajiv; Schneede, Joern; Bhan, Maharaj K; Sommerfelt, Halvor. 2007. Folate, but not vitamin B-12 status, predicts respiratory morbidity in north Indian children. American Journal of Clinical Nutrition. 86: 139-144.
  • Størksen, Ingunn; Røysamb, Espen; Gjessing, Håkon K; Moum, Torbjørn; Tambs, Kristian. 2007. Marriages and psychological distress among adult offspring of divorce: A Norwegian study. Scandinavian Journal of Psychology. 48: 467-476. doi: 10.1111/j.1467-9450.2007.00601.x
  • Vollset, Stein Emil; Igland, Jannicke; Jenab, Mazda; Fredriksen, Åse; Meyer, Klaus; Eussen, Simone; Gjessing, Håkon K.; Ueland, Per Magne; Pera, Guillem; Sala, Núria; Agudo, Antonio; Capella, Gabriel; Del Giudice, Giuseppe; Palli, Domenico; Boeing, Heiner; Weikert, Cornelia; Bueno-de-Mesquita, H. Bas; Carneiro, Fátima; Pala, Valeria; Vineis, Paolo; Vineis, Valeria; Tumino, Rosario; Panico, Salvatore; Berglund, Göran; Manjer, Jonas; Stenling, Roger; Hallmans, Göran; Martinez, Carmen; Dorronsoro, Miren; Barricarte, Aurelio; Navarro, Carmen; Quiros, José R.; Quirós, José R.; Allen, Naomi; Key, Timothy J.; Bingham, Sheila; Linseisen, Jakob; Kaaks, Rudolf; Overvad, Kim; Tjønneland, Anne; Tjønneland, Anne; Büchner, Frederike L.; Büchner, Frederike L.; Peeters, Petra H.M.; Numans, Mattijs E.; Clavel-Chapelon, Francoise; Boutron-Ruault, Marie-Christine; Trichopoulou, Antonia; Lund, Eiliv; Slimani, Nadia; Ferrari, Pietro; Riboli, Elio; Gonzalez, Carlos A. 2007. The association of gastric cancer risk with plasma folate, cobalamin, and Methylenetetrahydrofolate reductase polymorphisms in the European prospective investigation into cancer and nutrition. Cancer Epidemiology, Biomarkers and Prevention. 16: 2416-2424. doi: 10.1158/1055-9965.EPI-07-0256
  • Økland, Inger; Gjessing, Håkon K.; Grøttum, Per; Eggebø, TM; Eik-Nes, Sturla. 2007. A new population-based term prediction method-evaluation of the FL-based predictions. Ultrasound in Obstetrics and Gynecology. 30: 367.
  • Økland, Inger; Gjessing, Håkon K.; Grøttum, Per; Eggebø, TM; Eik-Nes, Sturla. 2007. A new population-based term prediction method-evaluation of the BPD-based predictions. Ultrasound in Obstetrics and Gynecology. 30: 478-479.
  • Dominicus, Annica; Skrondal, Anders; Gjessing, Håkon K.; Pedersen, Nancy L; Palmgren, Juni. 2006. Likelihood ratio tests in behavioral genetics: Problems and solutions. Behavior Genetics. 36: 331-340. doi: 10.1007/s10519-005-9034-7
  • Eik-Nes, Sturla; Grøttum, Per; Gjessing, Håkon K. 2006. Regarding "Term prediction with ultrasound: evaluation of a new dating curve for biparietal diameter". Acta Obstetricia et Gynecologica Scandinavica. 85: 1276-1279.
  • Eik-Nes, Sturla; Grøttum, Per; Gjessing, Håkon K. 2006. Regarding "Term prediction with ultrasound: evaluation of a new dating curve for biparietal diameter". Acta Obstetricia et Gynecologica Scandinavica. 85: 1276-1278.
  • Gjesdal, Clara G.; Vollset, Stein Emil; Ueland, Per Magne; Refsum, Helga; Drevon, Christian; Gjessing, Håkon K.; Tell, Grethe S. 2006. Plasma total homocysteine level and bone mineral density - The Hordaland homocysteine study. Archives of Internal Medicine. 166: 88-94.
  • Gjessing, Håkon K.; Lie, Rolv Terje. 2006. Case-parent triads: Estimating single- and double-dose effects of fetal and maternal disease gene haplotypes. Annals of Human Genetics. 70: 382-396.
  • Gjessing, Håkon K.; Steiro, Christine; Becher, Georg; Christy, Alfred. 2006. Redusert analytisk tilgjengelighet for PCB i humusfarget vann. Vann. 41: 118-126.
  • Li, Huiling; Romieu, Isabelle; Sienra-Monge, Juan-Jose; Ramirez-Aguilar, Matiana; del Rio-Navarro, Blanca Estela; Kistner, Emily O; Gjessing, Håkon K.; Lara-Sanchez, Irma del Carmen; Chiu, Grace; London, Stephanie J. 2006. Genetic polymorphisms in arginase I and II and childhood asthma and atopy. Journal of Allergy and Clinical Immunology. 117: 119-126.
  • Nilsen, Roy M; Vollset, Stein Emil; Gjessing, Håkon K.; Magnus, Per; Meltzer, Helle Margrete; Haugen, Alice Margaretha; Ueland, Per M. 2006. Patterns and predictors of folic acid supplement use among pregnant women: the Norwegian Mother and Child Cohort Study. American Journal of Clinical Nutrition. 84: 1134-1141.
  • Vollset, Stein Emil; Tverdal, Aage; Gjessing, Håkon K. 2006. Smoking and deaths between 40 and 70 years of age in women and men. Annals of Internal Medicine. 144: 381-389.
  • Gjessing, Håkon K; Lie, Rolv Terje. 2005. Case-parent triads: Estimating single- and double-dose effects of fetal and maternal disease gene haplotypes. Annals of Human Genetics. 69: 1-15.
  • Vollset, Stein Emil; Gjessing, Håkon K; Tandberg, Anne; Rønning, Thorbjørn; Irgens, Lorentz; Baste, Valborg; Nilsen, Roy Miodini; Daltveit, Anne Kjersti. 2005. Folate supplementation and twin pregnancies. Epidemiology. 16: 201-205.
  • Aalen, Odd Olai; Gjessing, Håkon K. 2004. Survival models based on the Ornstein-Uhlenbeck process. Lifetime Data Analysis. 10: 407-423.
  • Lie, Stein Atle; Engesæter, Lars B.; Havelin, Leif Ivar; Gjessing, Håkon K; Vollset, Stein Emil. 2004. Dependency issues in survival analyses of 55 782 primary hip replacements from 47 355 patients. Statistics in Medicine. 23: 3227-3240.
  • Moger, Tron Anders; Aalen, Odd Olai; Heimdal, K; Gjessing, Håkon K. 2004. Analysis of testicular cancer data using a frailty model with familial dependence. Statistics in Medicine. 23: 617-632.
  • Steinsland, Hans; Valentiner-Branth, Palle; Gjessing, Håkon K; Aaby, Peter; Mølbak, Kåre; Sommerfelt, Halvor. 2004. Protection from natural infections with enterotoxigenic Escherichia coli: longitudinal study. Ugeskrift for læger. 166: 4051-4053.
  • Gjessing, Håkon K; Aalen, Odd Olai; Hjort, Nils Lid. 2003. Frailty models based on L{\'e}vy processes. Advances in Applied Probability. 35: 532-550.
  • Steinsland, Hans; Valentiner-Branth, Palle; Gjessing, Håkon K; Aaby, Peter; Mølbak, Kåre; Sommerfelt, Halvor. 2003. Protection from natural infections with enterotoxigenic Escherichia coli: longitudinal study. The Lancet. 362: 286-291.
  • Steinsland, Hans; Valentiner-Branth, Palle; Gjessing, Håkon K; Aaby, Peter; Mølbak, Kåre; Sommerfelt, Halvor. 2003. Protection from natural infections with enterotoxigenic Escherichia coli: longitudinal study. The Lancet. 362: 286-291.
  • Aalen, Odd Olai; Gjessing, Håkon K. 2001. Understanding the shape of the hazard rate: a process point of view. Statistical Science. 16: 1-22.
  • Block, H.W.; Savits, T.H.; Eberly, L.E.; Grambsch, P.; Connet, J.E.; Keiding, Niels; Aalen, Odd Olai; Gjessing, Håkon K. 2001. Understanding the shape of the hazard rate: A process point of view - Comments and rejoinder. Statistical Science. 16: 14-22.
  • Magnus, Per; Gjessing, Håkon K; Skrondal, Anders; Skjærven, Rolv. 2001. Paternal contribution to birth weight. Journal of Epidemiology and Community Health. 55: 873-877.
  • Strand, Tor A.; Briles, D.E.; Gjessing, Håkon K; Maage, Amund; Bahn, M.K.; Sommerfelt, Halvor. 2001. Pneumococcal pulmonary infection, septicaemia and survival in young zinc-depleted mice. British Journal of Nutrition. 86: 301-306.
  • Benth, FE; Gjessing, Håkon K. 2000. A nonlinear parabolic equation with noise - A reduction method. Potential Analysis. 12: 385-401.
  • Benth, Fred Espen; Gjessing, Håkon K. 2000. A nonlinear parabolic equation with noise. A reduction method. Potential Analysis. 12: 385-401.
  • Grewal, Harleen M. S.; Karlsen, Tom Hemming; Vetvik, H; Ahren, C; Gjessing, Håkon K; Sommerfelt, Halvor; Haneberg, B. 2000. Measurement of specific IgA in faecal extracts and intestinal lavage fluid for monitoring of mucosal immune responses. JIM - Journal of Immunological Methods. 239: 53-62.
  • Grewal, Harleen M. S.; Karlsen, Tom Hemming; Vetvik, Helene; Ahrens, C.H.; Gjessing, Håkon K; Sommerfelt, Halvor; Haneberg, Bjørn. 2000. Measurement of specific IgA in faecal extracts and intestinal lavage fluid for monitoring of mucosal immune responses. JIM - Journal of Immunological Methods. 239: 53-62.
  • Grewal, Harleen M. S.; Karlsen, Tom Hemming; Vetvik, Helene; Åhrén, Christina; Gjessing, Håkon K; Sommerfelt, Halvor; Haneberg, Bjørn. 2000. Measurement of specific IgA in faecal extracts and intestinal lavage fluid for monitoring of mucosal immune responses. JIM - Journal of Immunological Methods. 239: 53-62.
  • Lie, S.A.; Engesæter, L.B.; Havelin, L.I.; Gjessing, Håkon K; Vollset, Stein Emil. 2000. Mortality after total hip replacement - 0-10-year follow-up of 39,543 patients in the Norwegian Arthroplasty Register. Acta Orthopaedica Scandinavica. 71: 19-27.
  • Lie, Stein A; Engesæter, Lars B.; Havelin, Leif Ivar; Gjessing, Håkon K; Vollset, Stein Emil. 2000. Mortality after total hip replacement: 0-10-year follow-up of 39,543 patients in the Norwegian Arthroplasty Register. Acta Orthopaedica Scandinavica. 71: 19-27.
  • Melve, K.K.; Gjessing, Håkon K; Skjærven, Rolv; Oyen, N. 2000. Infants' length at birth: an independent effect on perinatal mortality. Acta Obstetricia et Gynecologica Scandinavica. 79: 459-464.
  • Melve, Kari Klungsøyr; Gjessing, Håkon K; Skjærven, Rolv; Øyen, Nina. 2000. Infant's length at birth: an independent effect on perinatal mortality. Acta Obstetricia et Gynecologica Scandinavica. 79: 459-464.
  • Skjærven, Rolv; Gjessing, Håkon K; Bakketeig, LS. 2000. Birthweight by gestational age in Norway. Acta Obstetricia et Gynecologica Scandinavica. 79: 440-449.
  • Skjærven, Rolv; Gjessing, Håkon K; Bakketeig, LS. 2000. New standards for birth weight by gestational age using family data. American Journal of Obstetrics and Gynecology. 183: 689-696.
  • Skjærven, Rolv; Gjessing, Håkon K; Bakketeig, Leif S. 2000. New standards for birth weight by gestational age using family data. American Journal of Obstetrics and Gynecology. 183: 689-696.
  • Skjærven, Rolv; Gjessing, Håkon K; Bakketeig, Leif S. 2000. Birthweight by gestational age in Norway. Acta Obstetricia et Gynecologica Scandinavica. 79: 440-449.
  • Vollset, Stein Emil; Refsum, Helga; Irgens, Lorentz; Emblem, BM; Tverdal, A; Gjessing, Håkon K; Monsen, Anne-Lise Bjørke; Ueland, Per Magne. 2000. Plasma total homocysteine, pregnancy complications, and adverse pregnancy outcomes: the Hordaland Homocysteine Study. American Journal of Clinical Nutrition. 71: 962-968.
  • Vollset, Stein Emil; Refsum, Helge; Irgens, Lorentz M.; Emblem, B.M.; Tverdal, A.; Gjessing, Håkon K; Monsen, A.-L. Bjørke; Ueland, Per Magne. 2000. Plasma total homocysteine, pregnancy complications, and adverse pregnancy outcomes: the Hordaland Homocysteine Study. American Journal of Clinical Nutrition. 71: 962-968.
  • Melve, K.K.; Skjærven, Rolv; Gjessing, Håkon K; Oyen, N. 1999. Recurrence of gestational age in sibships: Implications for perinatal mortality. American Journal of Epidemiology. 150: 756-762.
  • Melve, Kari Klungsøyr.; Skjærven, Rolv; Gjessing, Håkon K.; Øyen, Nina. 1999. Recurrence of gestational age in sibships: Implications for perinatal mortality. American Journal of Epidemiology. 150: 756-762.
  • Valentiner-Brandt, Palle; Steinsland, Hans; Gjessing, Håkon K; Santos, Gina; Bhan, Maharaj; Aaby, Peter; Sommerfelt, Halvor; Mølbak, Kåre. 1999. Community-based randomized controlled trial of reduced osmolarity oral rehydration solution in acute childhood diarrhea. Pediatr Infect Dis J. 18: 789-795.
  • Lie, Rolv Terje; Rasmussen, S.; Brunborg, H.; Gjessing, Håkon; Lie-Nielsen, E.; Irgens, L. M. 1998. Fetal and maternal contributions to risk of pre-eclampsia: population based study. BMJ (British Medical Journal). 316: 1343-1347.
  • Gjessing, Håkon; Paulsen, Jostein. 1997. Present value distributions with applications to ruin theory and stochastic equations. Stochastic Processes and their Applications. 71: 123-144.
  • Gjessing, Håkon; Paulsen, Jostein. 1997. Present value distributions with applications to ruin theory and stochastic equations. Stochastic Processes and their Applications. 71: 123-144.
  • Lie, Rolv Terje; Rasmussen, Svein; Brunborg, H.; Gjessing, Håkon; Lie-Nielsen, Erik; Irgens, Lorentz. 1997. Fetal and maternal contributions to risk of pre-eclampsia: population based study. BMJ (British Medical Journal). 316: 1343-47.
  • Paulsen, Jostein; Gjessing, Håkon. 1997. Optimal choice of dividend barriers for a risk process with stochastic return on investments. Insurance, Mathematics & Economics. 20: 215-223.
  • Paulsen, Jostein; Gjessing, Håkon. 1997. Optimal choice of dividend barriers for a risk process with stochastic return on investments. Insurance, Mathematics & Economics. 20: 215-223.
  • Paulsen, Jostein; Gjessing, Håkon. 1997. Ruin theory with stochastic return on investments. Advances in Applied Probability. 29: 965-985.
  • Paulsen, Jostein; Gjessing, Håkon. 1997. Ruin theory with stochastic return on investments. Advances in Applied Probability. 29: 965-985.
  • Pierce, Richard; Gjessing, Håkon K. 1994. A stochastic model for the presence/absence of readings in Nidrstigningar Saga. World archaeology.
Reports and theses
  • Vollset, Stein Emil; Selmer, Randi Marie; Tverdal, Aage; Gjessing, Håkon K. 2006. Hvor dødelig er røyking? Rapport om dødsfall og tapte leveår som skyldes røyking. rapport Nasjonalt folkehelseinstitutt. 2006:4. Nasjonalt folkehelseinstitutt, Oslo. 24 pages.
  • Vollset, Stein Emil; selmer, randi; Tverdal, Aage; Gjessing, Håkon K. 2006. Hvor dødelig er røyking? Rapport om dødsfall og tapte leveår som skyldes røyking. Folkehelseinstituttet, Oslo. 24 pages.
  • Gjessing, Håkon. 1995. Anticipating calculus and wick products. Department of Mathematics, University of Bergen, Bergen.
  • Gjessing, Håkon K. 1994. Integral conditions for Skorod stochastical differential equations. Reports Published by the Department of Statistics. 24. UiB-MatNat: Matematisk institutt.
  • Gjessing, Håkon K. 1993. A note on the Wick product. Report No.23 March 1993. Reports publ.by the Inst.of Mathematics, Dept.of Statistics. Universitetet i Bergen, matematisk institutt.
  • Gjessing, Håkon. 1990. Some convergence results for ITO diffusions and optimal stopping.
Book sections
  • Aalen, Odd Olai; Gjessing, Håkon K. 2003. A look behind survival data: Underlying processes and quasi-stationarity. Chapter 15, pages 221-234. In:
    • Lindqvist, Bo; Doksum, Kjell. 2003. Mathematical and Statistical Methods in Reliability. World Scientific. 548 pages. ISBN: 981-238-321-2.

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