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  • E-mailHakon.Gjessing@uib.no
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    Kalfarveien 31
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    Postboks 7804
    5020 Bergen
Academic article
  • 2020. Seasonal and pandemic influenza during pregnancy and risk of fetal death: A Norwegian registry‑based cohort study. European Journal of Epidemiology (EJE). 9 pages.
  • 2020. PHLDA2 gene polymorphisms and risk of HELLP syndrome and severe preeclampsia. Pregnancy Hypertension. 190-194.
  • 2020. Design efficiency in genetic association studies. Statistics in Medicine. 19 pages.
  • 2019. Placental epigenetic clocks: estimating gestational age using placental DNA methylation levels. Aging. 4238-4253.
  • 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 (EJE). 383-396.
  • 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. 11 pages.
  • 2019. Association of Household Income with Life Expectancy and Cause-Specific Mortality in Norway, 2005-2015. Journal of the American Medical Association (JAMA). 1916-1925.
  • 2019. A genome-wide scan of cleft lip triads identifies parent-of-origin interaction effects between ANK3 and maternal smoking, and between ARHGEF10 and alcohol consumption. F1000 Research. 28 pages.
  • 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. 17 pages.
  • 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. 16 pages.
  • 2017. Variants in the fetal genome near FLT1 are associated with risk of preeclampsia. Nature Genetics. 1255-1260.
  • 2017. Symfyse-fundus-mål – prediktiv verdi av ny referansekurve. Tidsskrift for Den norske legeforening. 717-720.
  • 2017. Svangerskapsdatering. Norsk Epidemiologi. 13-18.
  • 2017. Parent-of-origin-environment interactions in case-parent triads with or without independent controls. Annals of Human Genetics. 60-73.
  • 2017. Human birth weight and reproductive immunology: testing for interactions between maternal and offspring KIR and HLA-C genes. Human Heredity. 181-193.
  • 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. 19 pages.
  • 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. 23 pages.
  • 2017. A Population-Based Study of Effects of Genetic Loci on Orofacial Clefts. Journal of Dental Research. 1322-1329.
  • 2016. Seed viability and germination success of Acacia tortilis along land-use and aridity gradients in the Eastern Sahara. Ecology and Evolution. 256-266.
  • 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. 1167-1173.
  • 2016. Prediction of gestational age based on genome-wide differentially methylated regions. Genome Biology. 9 pages.
  • 2016. Fetal size monitoring and birth-weight prediction: a new population-based approach. Ultrasound in Obstetrics and Gynecology. 500-507.
  • 2016. Estimation of fetal weight in pregnancies past term. Acta Obstetricia et Gynecologica Scandinavica. 183-189.
  • 2015. Genetic determinants of enterovirus infections: Polymorphisms in type 1 diabetes and innate immune genes in the MIDIA study. Viral immunology. 556-563.
  • 2014. Maternal KIR in combination with paternal HLA-C2 regulate human birth weight. Journal of Immunology. 5069-5073.
  • 2014. KIR and HLA-C: Immunogenetic regulation of human birth weight. Norsk Epidemiologi. 107-110.
  • 2013. X-chromosomal maternal and fetal SNPs and the risk of spontaneous preterm delivery in a Danish/Norwegian genome-wide association study. PLOS ONE. 11 pages.
  • 2013. Risk of Fetal Death after Pandemic Influenza Virus Infection or Vaccination. New England Journal of Medicine. 333-340.
  • 2013. GWAS of 126,559 Individuals Identifies Genetic Variants Associated with Educational Attainment. Science. 1467-1471.
  • 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 (EJE). 35-43.
  • 2013. A new population-based reference curve for symphysis-fundus height. Acta Obstetricia et Gynecologica Scandinavica. 925-933.
  • 2012. X-Linked Genes and Risk of Orofacial Clefts: Evidence from Two Population-Based Studies in Scandinavia. PLOS ONE.
  • 2012. Using offspring-parent triads to study complex traits : a tutorial based on orofacial clefts. Norsk Epidemiologi. 251-267.
  • 2012. Risk factors for extended duration of acute diarrhea in young children. PLOS ONE.
  • 2012. Relative importance of risk factors for coronary heart disease - The Hordaland Homocysteine Study. Scandinavian Cardiovascular Journal. 316-323.
  • 2012. Maternal tryptophan and kynurenine pathway metabolites and risk of preeclampsia. Obstetrics and Gynecology. 1243-1250.
  • 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. s262-s270.
  • 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. 241-250.
  • 2012. Application of a Novel Hybrid Study Design to Explore Gene-Environment Interactions in Orofacial Clefts. Annals of Human Genetics. 221-236.
  • 2012. Advantages of the population-based approach to pregnancy dating: results from 23 020 ultrasound examinations. Ultrasound in Obstetrics and Gynecology. 563-568.
  • 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. 82-87.
  • 2011. Intake of probiotic food and risk of spontaneous preterm delivery. American Journal of Clinical Nutrition. 151-157.
  • 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 Part A: Clinical and Molecular Teratology. 85-92.
  • 2011. Extensive variation and low heritability of DNA methylation identified in a twin study. Genome Research. 1813-1821.
  • 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.
  • 2011. A new population-based term prediction model vs. two traditional sample-based models: validation on 9046 ultrasound examinations. Ultrasound in Obstetrics and Gynecology. 207-213.
  • 2011. A hierarchical frailty model applied to two-generation melanoma data. Lifetime Data Analysis. 445-460.
  • 2010. Recurrent events and the exploding Cox model. Lifetime Data Analysis. 525-546.
  • 2010. Maternal genes and facial clefts in offspring: a comprehensive search for genetic associations in two population-based cleft studies from Scandinavia. PLOS ONE.
  • 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. 7 pages.
  • 2010. Biases of traditional term prediction models: results from different sample-based models evaluated on 41 343 ultrasound examinations. Ultrasound in Obstetrics and Gynecology. 728-734.
  • 2009. Vaccination as teenagers against meningococcal disease and the risk of the chronic fatigue syndrome. Vaccine. 23-27.
  • 2009. Self-selection and bias in a large prospective pregnancy cohort in Norway. Paediatric and Perinatal Epidemiology. 597-608.
  • 2009. Oral facial clefts and gene polymorphisms in metabolism of folate/one-carbon and vitamin A: a pathway-wide association study. Genetic Epidemiology. 247-255.
  • 2009. Genetic determinants of facial clefting: analysis of 357 candidate genes using two national cleft studies from Scandinavia. PLOS ONE.
  • 2008. Maternal smoking and oral clefts - The role of detoxification pathway genes. Epidemiology. 606-615.
  • 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. 413-424.
  • 2008. Biometrical modelling in genetics: are complex traits too complex? Statistical Methods in Medical Research. 75-96.
  • 2008. Biometrical modeling of twin and family data using standard mixed model software. Biometrics. 280-288.
  • 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. 2416-2424.
  • 2007. Marriages and psychological distress among adult offspring of divorce: A Norwegian study. Scandinavian Journal of Psychology. 467-476.
  • 2007. Genetic polymorphisms in transforming growth factor beta-1 (TGFB1) and childhood asthma and atopy. Human Genetics. 529-538.
  • 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. 734-741.
  • 2007. Folate, but not vitamin B-12 status, predicts respiratory morbidity in north Indian children. American Journal of Clinical Nutrition. 139-144.
  • 2007. A direct method for ultrasound prediction of day of delivery: a new, population-based approach. Ultrasound in Obstetrics and Gynecology. 19-27.
  • 2006. Smoking and deaths between 40 and 70 years of age in women and men. Annals of Internal Medicine. 381-389.
  • 2006. Plasma total homocysteine level and bone mineral density - The Hordaland homocysteine study. Archives of Internal Medicine. 88-94.
  • 2006. Patterns and predictors of folic acid supplement use among pregnant women: the Norwegian Mother and Child Cohort Study. American Journal of Clinical Nutrition. 1134-1141.
  • 2006. Likelihood ratio tests in behavioral genetics: Problems and solutions. Behavior Genetics. 331-340.
  • 2006. Genetic polymorphisms in arginase I and II and childhood asthma and atopy. Journal of Allergy and Clinical Immunology. 119-126.
  • 2006. Case-parent triads: Estimating single- and double-dose effects of fetal and maternal disease gene haplotypes. Annals of Human Genetics. 382-396.
  • 2005. Folate supplementation and twin pregnancies. Epidemiology. 201-205.
  • 2005. Case-parent triads: Estimating single- and double-dose effects of fetal and maternal disease gene haplotypes. Annals of Human Genetics. 1-15.
  • 2004. Survival models based on the Ornstein-Uhlenbeck process. Lifetime Data Analysis. 407-423.
  • 2004. Protection from natural infections with enterotoxigenic Escherichia coli: longitudinal study. Ugeskrift for læger. 4051-4053.
  • 2004. Dependency issues in survival analyses of 55 782 primary hip replacements from 47 355 patients. Statistics in Medicine. 3227-3240.
  • 2004. Analysis of testicular cancer data using a frailty model with familial dependence. Statistics in Medicine. 617-632.
  • 2003. Protection from natural infections with enterotoxigenic Escherichia coli: longitudinal study. The Lancet. 286-291.
  • 2003. Protection from natural infections with enterotoxigenic Escherichia coli: longitudinal study. The Lancet. 286-291.
  • 2003. Frailty models based on L{\'e}vy processes. Advances in Applied Probability. 532-550.
  • 2001. Understanding the shape of the hazard rate: a process point of view. Statistical Science. 1-22.
  • 2001. Understanding the shape of the hazard rate: A process point of view - Comments and rejoinder. Statistical Science. 14-22.
  • 2001. Pneumococcal pulmonary infection, septicaemia and survival in young zinc-depleted mice. British Journal of Nutrition. 301-306.
  • 2001. Paternal contribution to birth weight. Journal of Epidemiology and Community Health. 873-877.
  • 2000. Plasma total homocysteine, pregnancy complications, and adverse pregnancy outcomes: the Hordaland Homocysteine Study. American Journal of Clinical Nutrition. 962-968.
  • 2000. Plasma total homocysteine, pregnancy complications, and adverse pregnancy outcomes: the Hordaland Homocysteine Study. American Journal of Clinical Nutrition. 962-968.
  • 2000. New standards for birth weight by gestational age using family data. American Journal of Obstetrics and Gynecology. 689-696.
  • 2000. New standards for birth weight by gestational age using family data. American Journal of Obstetrics and Gynecology. 689-696.
  • 2000. Mortality after total hip replacement: 0-10-year follow-up of 39,543 patients in the Norwegian Arthroplasty Register. Acta Orthopaedica Scandinavica. 19-27.
  • 2000. Mortality after total hip replacement - 0-10-year follow-up of 39,543 patients in the Norwegian Arthroplasty Register. Acta Orthopaedica Scandinavica. 19-27.
  • 2000. Measurement of specific IgA in faecal extracts and intestinal lavage fluid for monitoring of mucosal immune responses. JIM - Journal of Immunological Methods. 53-62.
  • 2000. Measurement of specific IgA in faecal extracts and intestinal lavage fluid for monitoring of mucosal immune responses. JIM - Journal of Immunological Methods. 53-62.
  • 2000. Measurement of specific IgA in faecal extracts and intestinal lavage fluid for monitoring of mucosal immune responses. JIM - Journal of Immunological Methods. 53-62.
  • 2000. Infants' length at birth: an independent effect on perinatal mortality. Acta Obstetricia et Gynecologica Scandinavica. 459-464.
  • 2000. Infant's length at birth: an independent effect on perinatal mortality. Acta Obstetricia et Gynecologica Scandinavica. 459-464.
  • 2000. Birthweight by gestational age in Norway. Acta Obstetricia et Gynecologica Scandinavica. 440-449.
  • 2000. Birthweight by gestational age in Norway. Acta Obstetricia et Gynecologica Scandinavica. 440-449.
  • 2000. A nonlinear parabolic equation with noise. A reduction method. Potential Analysis. 385-401.
  • 2000. A nonlinear parabolic equation with noise - A reduction method. Potential Analysis. 385-401.
  • 1999. Recurrence of gestational age in sibships: Implications for perinatal mortality. American Journal of Epidemiology. 756-762.
  • 1999. Recurrence of gestational age in sibships: Implications for perinatal mortality. American Journal of Epidemiology. 756-762.
  • 1999. Community-based randomized controlled trial of reduced osmolarity oral rehydration solution in acute childhood diarrhea. Pediatr Infect Dis J. 789-795.
  • 1998. Fetal and maternal contributions to risk of pre-eclampsia: population based study. BMJ. British Medical Journal. 1343-1347.
  • 1997. Ruin theory with stochastic return on investments. Advances in Applied Probability. 965-985.
  • 1997. Ruin theory with stochastic return on investments. Advances in Applied Probability. 965-985.
  • 1997. Present value distributions with applications to ruin theory and stochastic equations. Stochastic Processes and their Applications. 123-144.
  • 1997. Present value distributions with applications to ruin theory and stochastic equations. Stochastic Processes and their Applications. 123-144.
  • 1997. Optimal choice of dividend barriers for a risk process with stochastic return on investments. Insurance, Mathematics & Economics. 215-223.
  • 1997. Optimal choice of dividend barriers for a risk process with stochastic return on investments. Insurance, Mathematics & Economics. 215-223.
  • 1997. Fetal and maternal contributions to risk of pre-eclampsia: population based study. BMJ. British Medical Journal. 1343-47.
  • 1994. A stochastic model for the presence/absence of readings in Nidrstigningar Saga. World archaeology.
Report
  • 2006. Hvor dødelig er røyking? Rapport om dødsfall og tapte leveår som skyldes røyking. .
  • 2006. Hvor dødelig er røyking? Rapport om dødsfall og tapte leveår som skyldes røyking. 2006:4. 2006:4. .
  • 1994. Integral conditions for Skorod stochastical differential equations. 24. 24. .
  • 1993. A note on the Wick product. Report No.23 March 1993. .
Popular scientific lecture
  • 1997. Blødninger tidlig i svangerskapet; farligere enn tidligere antatt?
Academic lecture
  • 2016. Prenatal detection of macrosomia in pregnancies past term.
  • 2016. Prenatal detection of low birthweight in pregnancies past term.
  • 2016. Estimation of fetal weight in pregnancies past term.
  • 2005. Folate, but not cobalamin status predicts respiratory morbidity in north Indian children.
  • 2001. Frailty as a stochastic process.
  • 1999. Patient mortality after total hip replacement - follow-up of 35938 patients in the Norwegian Arthroplasty Register.
  • 1999. Mortality after total hip replacement. 10 years follow-up of 39453 patients in the Norwegian Arthroplasty Register.
  • 1998. Perinatal mortality and infants' length at birth.
  • 1998. Distinguishing maternal and fetal contributions to birth weight using half-sib data.
  • 1997. Svangerskapsvarigheter og fødselsvekter, noe for en statistiker?
  • 1997. Svangerskapsvarigheter og fødselsvekter, noe for en statistiker?
  • 1997. Svangerskapsvarigheter og fødselsvekter, noe for en statistiker?
  • 1997. New standards for birth weight by gestational age using family data.
  • 1997. Føtalt og maternelt bidrag til risiko for preeklampsi.
  • 1997. Føtalt og maternelt bidrag til risiko for preeklampsi.
  • 1997. Føtalt og maternelt bidrag til risiko for preeklampsi.
  • 1997. Errors in gestational age. A somewhat different analysis of errors in computed length of gestation, using birth weight as reference.
  • 1997. Errors in gestational age. A somewhat different analysis of errors in computed length of gestation, using birth weight as reference.
  • 1997. Errors in gestational age. A somewhat different analysis of errors in computed length of gestation, using birth weight as reference.
  • 1996. A variation of parameters solution of a quasi-linear Skorohod stochastic differential equations using the Wick product.
Editorial
  • 2019. Editorial. Scandinavian Journal of Statistics. 1-1.
  • 2013. Risk of Fetal Death After Pandemic Influenza Virus Infection or Vaccination EDITORIAL COMMENT. Obstetrical and Gynecological Survey. 348-349.
Reader opinion piece
  • 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. 944-946.
  • 2007. Accuracy of second trimester fetal head circumference and biparietal diameter for predicting the time of spontaneous birth. Journal of Perinatal Medicine. 350-351.
  • 2006. Regarding "Term prediction with ultrasound: evaluation of a new dating curve for biparietal diameter". Acta Obstetricia et Gynecologica Scandinavica. 1276-1278.
Academic monograph
  • 2008. Survival and event history analysis: a process point of view. 2008.
  • 2008. Survival and Event History Analysis: A Process Point of View.
  • 2008. Event history analysis: A process point of view.
Thesis at a second degree level
  • 1990. Some convergence results for ITO diffusions and optimal stopping.
Popular scientific article
  • 2006. Redusert analytisk tilgjengelighet for PCB i humusfarget vann. Vann. 118-126.
Letter to the editor
  • 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.
  • 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. 225-227.
  • 2006. Regarding "Term prediction with ultrasound: evaluation of a new dating curve for biparietal diameter". Acta Obstetricia et Gynecologica Scandinavica. 1276-1279.
Doctoral dissertation
  • 1995. Anticipating calculus and wick products.
Academic chapter/article/Conference paper
  • 2003. A look behind survival data: Underlying processes and quasi-stationarity. 14 pages.
Abstract
  • 2016. Prenatal detection of macrosomia in pregnancies past term. Ultrasound in Obstetrics and Gynecology.
  • 2016. Prenatal detection of low birthweight in pregnancies past term. Ultrasound in Obstetrics and Gynecology.
  • 2016. Estimation of fetal weight in pregnancies past term. Ultrasound in Obstetrics and Gynecology.
  • 2012. The 2009 Influenza Pandemic, Vaccination during Pregnancy and Fetal Death: A National Registry-Based Study in Norway. Pharmacoepidemiology and Drug Safety. 382-382.
  • 2012. OP32.01: The importance of standardizing pregnancy dating models. Ultrasound in Obstetrics and Gynecology. 151-152.
  • 2012. Intake of food with antimicrobial diet components and risk of spontaneous preterm delivery. American Journal of Obstetrics and Gynecology. S213-S213.
  • 2012. Genetic variants in gene-environment interaction analysis of probiotic intake in spontaneous preterm delivery. American Journal of Obstetrics and Gynecology. S212-S212.
  • 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. 116-117.
  • 2012. A population-based reference chart for fundal height measures. Acta Obstetricia et Gynecologica Scandinavica. 117-118.
  • 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. 478-478.
  • 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. S142-S142.
  • 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. S142.
  • 2007. A new population-based term prediction method-evaluation of the FL-based predictions. Ultrasound in Obstetrics and Gynecology. 367.
  • 2007. A new population-based term prediction method-evaluation of the BPD-based predictions. Ultrasound in Obstetrics and Gynecology. 478-479.
Poster
  • 2015. Haplin — a powerful tool for studying gene-environment interactions.
  • 2010. Relative importance of risk factors for cardiovascular disease incidence and mortality: a prospective cohort study.
Article in business/trade/industry journal
  • 2019. Gene-methylation interactions: Discovering region-wise DNA methylation levels that modify SNP-associated disease risk. bioRxiv - the preprint server for biology.

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