Academic article

• Miriam Gjerdevik; Hans Ivar Hanevik; Siri Eldevik Håberg et al. (2026). Gestational age determination in pregnancies conceived via assisted reproductive technology. (external link)
• Jon Bohlin; Yunsung Lee; Ida Henriette Caspersen et al. (2026). Longitudinal study of genome-wide DNA methylation in individuals with and without post-acute symptoms following SARS-CoV-2 infection. (external link)
• Yunsung Lee; Håkon Kristian Gjessing; Christian Magnus Page et al. (2025). Methylation differences between assisted reproductive technology-conceived and naturally conceived children near BRCA1 and NBR2. (external link)
• Hsi Hsuan Yang; Claire Baldauf; Trevor A. Pickering et al. (2025). Maternal and Fetal SERPINA3 Polymorphisms and Risk of Preeclampsia: A Dyad and Triad Based Case-Control Study. (external link)
• Siri Nærland Skodvin; Miriam Gjerdevik; Julia Romanowska et al. (2025). Statistical methods to disentangle genetic effects influencing infertility and early fetal viability with a genome-wide application. (external link)
• Yunsung Lee; Miriam Gjerdevik; Astanand Jugessur et al. (2025). Parent-of-Origin Effects in Childhood Asthma at Seven Years of Age. (external link)
• Siri Nærland Skodvin; Håkon K. Gjessing; Astanand Jugessur et al. (2025). Genome-Wide Association Analyses in Family Triads and Dyads Following Assisted Reproductive Technology. (external link)
• Claire Baldauf; Chen Wei; Trevor A. Pickering et al. (2025). Hypoxia-Inducible Factor 1-Alpha Gene Polymorphisms Impact Risk of Severespectrum Hypertensive Disorders of Pregnancy: A Case-Control Study. (external link)
• Jon Bohlin; Siri Eldevik Håberg; Per Minor Magnus et al. (2024). MinLinMo: a minimalist approach to variable selection and linear model prediction. (external link)
• Håkon K. Gjessing; Per Grøttum; Johan Morten Dreier et al. (2024). Biparietal diameter vs crown–rump length as standard parameter for late first-trimester pregnancy dating. (external link)
• Karoline Hansen Skåra; Yunsung Lee; Astanand Jugessur et al. (2024). Telomere length in relation to fecundability and use of assisted reproductive technologies: the Norwegian Mother, Father, and Child Cohort Study. (external link)
• Rolv T. Lie; Maria Christine Magnus; Håkon K. Gjessing et al. (2024). Daily snuff use during pregnancy, gestational length and birth weight; register-based study. (external link)
• Dana Kristjansson; Yunsung Lee; Christian Magnus Page et al. (2024). Sex differences in DNA methylation variations according to ART conception-evidence from the Norwegian mother, father, and child cohort study. (external link)
• Yunsung Lee; Astanand Jugessur; Håkon K. Gjessing et al. (2024). Effect of polygenic scores of telomere length alleles on telomere length in newborns and parents. (external link)
• Maria Christine Magnus; Anne K. Örtqvist; Stine Kjaer Urhoj et al. (2023). Infection with SARS-CoV-2 during pregnancy and risk of stillbirth: a Scandinavian registry study. (external link)
• Siri Nærland Skodvin; Håkon Kristian Gjessing; Astanand Jugessur et al. (2023). Statistical methods to detect mother-father genetic interaction effects on risk of infertility: A genome-wide approach. (external link)
• Julia Romanowska; Haakon Egdetveit Nustad; Christian Magnus Page et al. (2023). The X-factor in ART: does the use of assisted reproductive technologies influence DNA methylation on the X chromosome?. (external link)
• Ida Laake; Siri Nærland Skodvin; Kristine Blix et al. (2022). Effectiveness of mRNA booster vaccination against mild, moderate, and severe COVID-19 caused by the Omicron variant in a large, population-based, Norwegian cohort. (external link)
• Siri Eldevik Håberg; Christian Magnus Page; Yunsung Lee et al. (2022). DNA methylation in newborns conceived by assisted reproductive technology. (external link)
• Maria Christine Magnus; Anne K. Örtqvist; Elisabeth Dahlqwist et al. (2022). Association of SARS-CoV-2 Vaccination during Pregnancy with Pregnancy Outcomes. (external link)
• William Robert Paul Denault; Håkon K. Gjessing; Julius Juodakis et al. (2021). Wavelet Screening: a novel approach to analyzing GWAS data. (external link)
• Kristine Løkås Haftorn; Yunsung Lee; William Robert Paul Denault et al. (2021). An EPIC predictor of gestational age and its application to newborns conceived by assisted reproductive technologies. (external link)
• Maria Christine Magnus; Allen J. Wilcox; Elin Anita Fadum et al. (2021). Growth in children conceived by ART. (external link)
• Maria Christine Magnus; Laura L. Oakley; Håkon K. Gjessing et al. (2021). Pregnancy and risk of COVID-19: a Norwegian registry-linkage study. (external link)
• William Robert Paul Denault; Julia Romanowska; Øystein Ariansen Haaland et al. (2021). Wavelet Screening identifies regions highly enriched for differentially methylated loci for orofacial clefts. (external link)
• Maria Teresa Grønning Dale; Alexander Nissen; Mona Berthelsen et al. (2021). Psychosocial work factors and sick leave risk after a terrorist bomb attack: a survey and registry-based longitudinal study of governmental employees in Norway. (external link)
• William Robert Paul Denault; Julia Romanowska; Øyvind Helgeland et al. (2021). A fast wavelet-based functional association analysis replicates several susceptibility loci for birth weight in a Norwegian population. (external link)
• Nina Gunnes; Håkon K. Gjessing; Inger Johanne Landsjøåsen Bakken et al. (2020). Seasonal and pandemic influenza during pregnancy and risk of fetal death: A Norwegian registry‑based cohort study. (external link)
• Julia Romanowska; Øystein Ariansen Haaland; Astanand Jugessur et al. (2020). Gene-methylation interactions: Discovering region-wise DNA methylation levels that modify SNP-associated disease risk. (external link)
• Miriam Gjerdevik; Håkon K. Gjessing; Julia Romanowska et al. (2020). Design efficiency in genetic association studies. (external link)
• Li Ding; Matthew J. Blitz; Deborah A. Wing et al. (2020). PHLDA2 gene polymorphisms and risk of HELLP syndrome and severe preeclampsia. (external link)
• Yunsung Lee; Kristine Løkås Jacobsen; William Robert Paul Denault et al. (2020). Blood-based epigenetic estimators of chronological age in human adults using DNA methylation data from the Illumina MethylationEPIC array. (external link)
• Geir Drage Berentsen; Francesca Azzolini; Hans J. Skaug et al. (2020). Heritability curves: A local measure of heritability in family models. (external link)
• Miriam Gjerdevik; Astanand Jugessur; Øystein Ariansen Haaland et al. (2019). Haplin power analysis: a software module for power and sample size calculations in genetic association analyses of family triads and unrelated controls. (external link)
• Maria Teresa Grønning Dale; Per Magnus; Elisabeth Leirgul et al. (2019). Intake of sucrose‑sweetened soft beverages during pregnancy and risk of congenital heart defects (CHD) in offspring: A Norwegian pregnancy cohort study. (external link)
• Øystein Ariansen Haaland; Julia Romanowska; Miriam Gjerdevik et al. (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. (external link)
• Yunsung Lee; Sanaa Choufani; Rosanna Weksberg et al. (2019). Placental epigenetic clocks: estimating gestational age using placental DNA methylation levels. (external link)
• Jonas Minet Kinge; Jørgen Heibø Modalsli; Simon Nygaard Øverland et al. (2019). Association of Household Income with Life Expectancy and Cause-Specific Mortality in Norway, 2005-2015. (external link)
• Øystein Ariansen Haaland; Rolv T. Lie; Julia Romanowska et al. (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. (external link)
• Øivind Skare; Rolv T. Lie; Øystein Ariansen Haaland et al. (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. (external link)
• Håkon K. Gjessing (2017). Svangerskapsdatering. (external link)
• Michelle M. Clark; Olympe Chazara; Eric M. Sobel et al. (2017). Human birth weight and reproductive immunology: testing for interactions between maternal and offspring KIR and HLA-C genes. (external link)
• Ralph McGinnis; Valgerdur Steinthorsdottir; Nicholas O. Williams et al. (2017). Variants in the fetal genome near FLT1 are associated with risk of preeclampsia. (external link)
• Miriam Gjerdevik; Øystein Ariansen Haaland; Julia Romanowska et al. (2017). Parent-of-origin-environment interactions in case-parent triads with or without independent controls. (external link)
• Øivind Skare; Håkon K. Gjessing; Miriam Gjerdevik et al. (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. (external link)
• Øystein Ariansen Haaland; Astanand Jugessur; Miriam Gjerdevik et al. (2017). Genome-wide analysis of parent-of-origin interaction effects with environmental exposure (PoOxE): An application to European and Asian cleft palate trios. (external link)
• L M Moreno Uribe; Tatiana Fomina; R G Munger et al. (2017). A Population-Based Study of Effects of Genetic Loci on Orofacial Clefts. (external link)
• Aase Serine Devold Pay; Frederik Frøen; Anne Cathrine Staff et al. (2017). Symfyse-fundus-mål – prediktiv verdi av ny referansekurve. (external link)
• Aase Serine Devold Pay; Frederik Frøen; Anne Cathrine Staff et al. (2016). Prediction of small-for-gestational-age status by symphysis–fundus height: a registry-based population cohort study. (external link)
• Håkon K. Gjessing; Per Grøttum; Inger Økland et al. (2016). Fetal size monitoring and birth-weight prediction: a new population-based approach. (external link)
• Torbjørn Moe Eggebø; Olav-Andre Klefstad; Inger Økland et al. (2016). Estimation of fetal weight in pregnancies past term. (external link)
• Gidske Leknæs Andersen; Knut Krzywinski; Håkon K. Gjessing et al. (2016). Seed viability and germination success of Acacia tortilis along land-use and aridity gradients in the Eastern Sahara. (external link)
• Jon Bohlin; Siri Eldevik Håberg; Per Magnus et al. (2016). Prediction of gestational age based on genome-wide differentially methylated regions. (external link)
• Elisabet Witsø; Ondrej Cinek; German Tapia et al. (2015). Genetic determinants of enterovirus infections: Polymorphisms in type 1 diabetes and innate immune genes in the MIDIA study. (external link)
• SE Hiby; R Apps; O Chazara et al. (2014). Maternal KIR in combination with paternal HLA-C2 regulate human birth weight. (external link)
• Lydia E. Farrel; Susan E. Hiby; Richard Apps et al. (2014). KIR and HLA-C: Immunogenetic regulation of human birth weight. (external link)
• Cornelius A. Rietveld; SE Medland; J Derringer et al. (2013). GWAS of 126,559 Individuals Identifies Genetic Variants Associated with Educational Attainment. (external link)
• Aase Serine Devold Pay; Frederik Frøen; Anne Cathrine Staff et al. (2013). A new population-based reference curve for symphysis-fundus height. (external link)
• Solveig Myking; Heather A Boyd; Ronny Myhre et al. (2013). X-chromosomal maternal and fetal SNPs and the risk of spontaneous preterm delivery in a Danish/Norwegian genome-wide association study. (external link)
• Siri Eldevik Håberg; Lill Trogstad; Nina Gunnes et al. (2013). Risk of Fetal Death after Pandemic Influenza Virus Infection or Vaccination. (external link)
• Vidar Hjellvik; Randi Selmer; Håkon K. Gjessing et al. (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. (external link)
• Roy Miodini Nilsen; Anne Lise Bjørke Monsen; Øivind Midttun et al. (2012). Maternal tryptophan and kynurenine pathway metabolites and risk of preeclampsia. (external link)
• Halvor Sommerfelt; Hans Steinsland; Lize van der Merwe et al. (2012). Case/Control studies with follow-up: constructing the source population to estimate effects of risk factors on development, disease, and survival. (external link)
• Astanand Jugessur; Øivind Skare; Rolv T. Lie et al. (2012). X-Linked Genes and Risk of Orofacial Clefts: Evidence from Two Population-Based Studies in Scandinavia. (external link)
• Tor A Strand; Pushpa R Sharma; Håkon K. Gjessing et al. (2012). Risk factors for extended duration of acute diarrhea in young children. (external link)
• Astanand Jugessur; Øivind Skare; Jennifer Harris et al. (2012). Using offspring-parent triads to study complex traits : a tutorial based on orofacial clefts. (external link)
• Inger Økland; Ole Jakob Nakling; Håkon K. Gjessing et al. (2012). Advantages of the population-based approach to pregnancy dating: results from 23 020 ultrasound examinations. (external link)
• Jannicke Igland; Stein Emil Vollset; Ottar Nygård et al. (2012). Relative importance of risk factors for coronary heart disease - The Hordaland Homocysteine Study. (external link)
• Øivind Skare; Astanand Jugessur; Rolv T. Lie et al. (2012). Application of a Novel Hybrid Study Design to Explore Gene-Environment Interactions in Orofacial Clefts. (external link)
• Astanand Jugessur; Håkon K. Gjessing; Allen J Wilcox et al. (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. (external link)
• Inger Økland; Tore Bjåstad; Tonni Franke Johansen et al. (2011). Narrowed beam width in newer ultrasound machines shortens measurements in the lateral direction: fetal measurement charts may be obsolete. (external link)
• Solveig Myking; Ronny Myhre; Håkon Gjessing et al. (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. (external link)
• Astanand Jugessur; Min Shi; Håkon Gjessing et al. (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. (external link)
• Tron Anders Moger; Marion Haugen; Benjamin H. K. Yip et al. (2011). A hierarchical frailty model applied to two-generation melanoma data. (external link)
• Inger Økland; Håkon Gjessing; Per Grøttum et al. (2011). A new population-based term prediction model vs. two traditional sample-based models: validation on 9046 ultrasound examinations. (external link)
• Kristina Gervin; Martin Hammerø; Hanne Elisabeth Akselsen et al. (2011). Extensive variation and low heritability of DNA methylation identified in a twin study. (external link)
• Ronny Myhre; Anne Lise Brantsæter; Solveig Myking et al. (2011). Intake of probiotic food and risk of spontaneous preterm delivery. (external link)
• Inger Økland; Håkon Gjessing; Per Grøttum et al. (2010). Biases of traditional term prediction models: results from different sample-based models evaluated on 41 343 ultrasound examinations. (external link)
• Hege Vefring; Line L. Wee; Astanand Jugessur et al. (2010). Maternal angiotensinogen (AGT) haplotypes, fetal renin (REN) haplotypes and risk of preeclampsia; estimation of gene-gene interaction from family-triad data. (external link)
• Astanand Jugessur; Min Shi; Håkon K. Gjessing et al. (2010). Maternal genes and facial clefts in offspring: a comprehensive search for genetic associations in two population-based cleft studies from Scandinavia. (external link)
• Håkon K. Gjessing; Kjetil Røysland; Odd O. Aalen et al. (2010). Recurrent events and the exploding Cox model. (external link)
• Astanand Jugessur; Min Shi; Håkon K Gjessing et al. (2009). Genetic determinants of facial clefting: analysis of 357 candidate genes using two national cleft studies from Scandinavia. (external link)
• Roy M Nilsen; Stein Emil Vollset; Håkon K. Gjessing et al. (2009). Self-selection and bias in a large prospective pregnancy cohort in Norway. (external link)
• Per Magnus; Oddbjørn Brubakk; Oddbjørn Brubakk et al. (2009). Vaccination as teenagers against meningococcal disease and the risk of the chronic fatigue syndrome. (external link)
• Abee L. Boyles; Allen J. Wilcox; Jack A. Taylor et al. (2009). Oral facial clefts and gene polymorphisms in metabolism of folate/one-carbon and vitamin A: a pathway-wide association study. (external link)
• Astanand Jugessur; Fedik Rahimov; Rolv Terje Lie et al. (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. (external link)
• Rolv Terje Lie; Allen J Wilcox; Jack Taylor et al. (2008). Maternal smoking and oral clefts - The role of detoxification pathway genes. (external link)
• Sophia Rabe-Hesketh; Anders Skrondal; Håkon K. Gjessing (2008). Biometrical modeling of twin and family data using standard mixed model software. (external link)
• Håkon K. Gjessing; Rolv Terje Lie (2008). Biometrical modelling in genetics: are complex traits too complex?. (external link)
• Astrid Lunde; Kari Klungsøyr Melve; Håkon K. Gjessing et al. (2007). Genetic and environmental influences on birth weight, birth length, head circumference and gestational age using population based parent-offspring data. (external link)
• Ingunn Størksen; Espen Røysamb; Håkon K Gjessing et al. (2007). Marriages and psychological distress among adult offspring of divorce: A Norwegian study. (external link)
• Stein Emil Vollset; Jannicke Igland; Mazda Jenab et al. (2007). The association of gastric cancer risk with plasma folate, cobalamin, and Methylenetetrahydrofolate reductase polymorphisms in the European prospective investigation into cancer and nutrition. (external link)
• Tor A Strand; Sunita Taneja; Nita Bhandari et al. (2007). Folate, but not vitamin B-12 status, predicts respiratory morbidity in north Indian children. (external link)
• Huiling Li; Isabelle Romieu; Hao Wu et al. (2007). Genetic polymorphisms in transforming growth factor beta-1 (TGFB1) and childhood asthma and atopy. (external link)
• Håkon K. Gjessing; Per Grøttum; P Grottum et al. (2007). A direct method for ultrasound prediction of day of delivery: a new, population-based approach. (external link)
• Stein Emil Vollset; Aage Tverdal; Håkon K. Gjessing (2006). Smoking and deaths between 40 and 70 years of age in women and men. (external link)
• Roy M Nilsen; Stein Emil Vollset; Håkon K. Gjessing et al. (2006). Patterns and predictors of folic acid supplement use among pregnant women: the Norwegian Mother and Child Cohort Study. (external link)
• Clara G. Gjesdal; Stein Emil Vollset; Per Magne Ueland et al. (2006). Plasma total homocysteine level and bone mineral density - The Hordaland homocysteine study. (external link)
• Håkon K. Gjessing; Rolv Terje Lie (2006). Case-parent triads: Estimating single- and double-dose effects of fetal and maternal disease gene haplotypes. (external link)
• Huiling Li; Isabelle Romieu; Juan-Jose Sienra-Monge et al. (2006). Genetic polymorphisms in arginase I and II and childhood asthma and atopy. (external link)
• Annica Dominicus; Anders Skrondal; Håkon K. Gjessing et al. (2006). Likelihood ratio tests in behavioral genetics: Problems and solutions. (external link)
• Stein Emil Vollset; Håkon K Gjessing; Anne Tandberg et al. (2005). Folate supplementation and twin pregnancies. (external link)
• Håkon K Gjessing; Rolv Terje Lie (2005). Case-parent triads: Estimating single- and double-dose effects of fetal and maternal disease gene haplotypes. (external link)
• Stein Atle Lie; Lars B. Engesæter; Leif Ivar Havelin et al. (2004). Dependency issues in survival analyses of 55 782 primary hip replacements from 47 355 patients. (external link)
• Tron Anders Moger; Odd Olai Aalen; K Heimdal et al. (2004). Analysis of testicular cancer data using a frailty model with familial dependence. (external link)
• Hans Steinsland; Palle Valentiner-Branth; Håkon K Gjessing et al. (2004). Protection from natural infections with enterotoxigenic Escherichia coli: longitudinal study. (external link)
• Odd Olai Aalen; Håkon K. Gjessing (2004). Survival models based on the Ornstein-Uhlenbeck process. (external link)
• Hans Steinsland; Palle Valentiner-Branth; Håkon K Gjessing et al. (2003). Protection from natural infections with enterotoxigenic Escherichia coli: longitudinal study. (external link)
• Hans Steinsland; Palle Valentiner-Branth; Håkon K Gjessing et al. (2003). Protection from natural infections with enterotoxigenic Escherichia coli: longitudinal study. (external link)
• Håkon K Gjessing; Odd Olai Aalen; Nils Lid Hjort (2003). Frailty models based on L{\'e}vy processes. (external link)
• Tor A. Strand; D.E. Briles; Håkon K Gjessing et al. (2001). Pneumococcal pulmonary infection, septicaemia and survival in young zinc-depleted mice. (external link)
• H.W. Block; T.H. Savits; L.E. Eberly et al. (2001). Understanding the shape of the hazard rate: A process point of view - Comments and rejoinder. (external link)
• Per Magnus; Håkon K Gjessing; Anders Skrondal et al. (2001). Paternal contribution to birth weight. (external link)
• Odd Olai Aalen; Håkon K Gjessing (2001). Understanding the shape of the hazard rate: a process point of view. (external link)
• S.A. Lie; L.B. Engesæter; L.I. Havelin et al. (2000). Mortality after total hip replacement - 0-10-year follow-up of 39,543 patients in the Norwegian Arthroplasty Register. (external link)
• Harleen M. S. Grewal; Tom Hemming Karlsen; Helene Vetvik et al. (2000). Measurement of specific IgA in faecal extracts and intestinal lavage fluid for monitoring of mucosal immune responses. (external link)
• K.K. Melve; Håkon K Gjessing; Rolv Skjærven et al. (2000). Infants' length at birth: an independent effect on perinatal mortality. (external link)
• Stein Emil Vollset; Helge Refsum; Lorentz M. Irgens et al. (2000). Plasma total homocysteine, pregnancy complications, and adverse pregnancy outcomes: the Hordaland Homocysteine Study. (external link)
• Rolv Skjærven; Håkon K Gjessing; Leif S. Bakketeig (2000). Birthweight by gestational age in Norway. (external link)
• Rolv Skjærven; Håkon K Gjessing; Leif S. Bakketeig (2000). New standards for birth weight by gestational age using family data. (external link)
• Harleen M. S. Grewal; Tom Hemming Karlsen; Helene Vetvik et al. (2000). Measurement of specific IgA in faecal extracts and intestinal lavage fluid for monitoring of mucosal immune responses. (external link)
• Fred Espen Benth; Håkon K Gjessing (2000). A nonlinear parabolic equation with noise. A reduction method. (external link)
• Harleen M. S. Grewal; Tom Hemming Karlsen; H Vetvik et al. (2000). Measurement of specific IgA in faecal extracts and intestinal lavage fluid for monitoring of mucosal immune responses. (external link)
• FE Benth; Håkon K Gjessing (2000). A nonlinear parabolic equation with noise - A reduction method. (external link)
• Rolv Skjærven; Håkon K Gjessing; LS Bakketeig (2000). Birthweight by gestational age in Norway. (external link)
• Stein A Lie; Lars B. Engesæter; Leif Ivar Havelin et al. (2000). Mortality after total hip replacement: 0-10-year follow-up of 39,543 patients in the Norwegian Arthroplasty Register. (external link)
• Kari Klungsøyr Melve; Håkon K Gjessing; Rolv Skjærven et al. (2000). Infant's length at birth: an independent effect on perinatal mortality. (external link)
• Stein Emil Vollset; Helga Refsum; Lorentz Irgens et al. (2000). Plasma total homocysteine, pregnancy complications, and adverse pregnancy outcomes: the Hordaland Homocysteine Study. (external link)
• Rolv Skjærven; Håkon K Gjessing; LS Bakketeig (2000). New standards for birth weight by gestational age using family data. (external link)
• K.K. Melve; Rolv Skjærven; Håkon K Gjessing et al. (1999). Recurrence of gestational age in sibships: Implications for perinatal mortality. (external link)
• Kari Klungsøyr. Melve; Rolv Skjærven; Håkon K. Gjessing et al. (1999). Recurrence of gestational age in sibships: Implications for perinatal mortality. (external link)
• Palle Valentiner-Brandt; Hans Steinsland; Håkon K Gjessing et al. (1999). Community-based randomized controlled trial of reduced osmolarity oral rehydration solution in acute childhood diarrhea. (external link)
• Rolv Terje Lie; S. Rasmussen; H. Brunborg et al. (1998). Fetal and maternal contributions to risk of pre-eclampsia: population based study. (external link)
• Håkon Gjessing; Jostein Paulsen (1997). Present value distributions with applications to ruin theory and stochastic equations. (external link)
• Jostein Paulsen; Håkon Gjessing (1997). Optimal choice of dividend barriers for a risk process with stochastic return on investments. (external link)
• Håkon Gjessing; Jostein Paulsen (1997). Present value distributions with applications to ruin theory and stochastic equations. (external link)
• Jostein Paulsen; Håkon Gjessing (1997). Ruin theory with stochastic return on investments. (external link)
• Jostein Paulsen; Håkon Gjessing (1997). Optimal choice of dividend barriers for a risk process with stochastic return on investments. (external link)
• Jostein Paulsen; Håkon Gjessing (1997). Ruin theory with stochastic return on investments. (external link)
• Rolv Terje Lie; Svein Rasmussen; H. Brunborg et al. (1997). Fetal and maternal contributions to risk of pre-eclampsia: population based study. (external link)
• Richard Pierce; Håkon K. Gjessing (1994). A stochastic model for the presence/absence of readings in Nidrstigningar Saga. (external link)

Academic book chapter

• Odd Olai Aalen; Håkon K Gjessing (2003). A look behind survival data: Underlying processes and quasi-stationarity. (external link)

Academic monograph

• Odd O. Aalen; Ørnulf Borgan; Håkon K. Gjessing (2008). Survival and Event History Analysis: A Process Point of View. (external link)
• Odd O. Aalen; Ørnulf Borgan; Håkon K Gjessing (2008). Event history analysis: A process point of view. (external link)
• Odd O. Aalen; Ørnulf Borgan; Håkon K. Gjessing (2008). Survival and event history analysis: a process point of view. (external link)

Conference abstract

• Torbjørn Moe Eggebø; Olav-Andre Klefstad; Inger Økland et al. (2016). Prenatal detection of low birthweight in pregnancies past term. (external link)
• Torbjørn Moe Eggebø; Olav-Andre Klefstad; Inger Økland et al. (2016). Estimation of fetal weight in pregnancies past term. (external link)
• Torbjørn Moe Eggebø; Olav-Andre Klefstad; Inger Økland et al. (2016). Prenatal detection of macrosomia in pregnancies past term. (external link)
• Ingrid Økland; Håkon K. Gjessing; Per Grøttum et al. (2012). Advantages of the population-based approch to pregnancy dating demonstrated with results from 73,400 second-trimester ultrasound examinations. (external link)
• Inger Økland; Håkon K. Gjessing; Per Grøttum et al. (2012). OP32.01: The importance of standardizing pregnancy dating models. (external link)
• Bo Jacobsson; Anne Lise Brantsæter; Håkon Gjessing et al. (2012). Intake of food with antimicrobial diet components and risk of spontaneous preterm delivery. (external link)
• Siri Eldevik Håberg; Lill Trogstad; Nina Gunnes et al. (2012). The 2009 Influenza Pandemic, Vaccination during Pregnancy and Fetal Death: A National Registry-Based Study in Norway. (external link)
• Bo Jacobsson; Øivind Skare; Verena Sengpiel et al. (2012). Genetic variants in gene-environment interaction analysis of probiotic intake in spontaneous preterm delivery. (external link)
• Aase Serine Devold Pay; Håkon K. Gjessing; Anne Cathrine Staff et al. (2012). A population-based reference chart for fundal height measures. (external link)
• Rolv T. Lie; Håkon K Gjessing; Jack Taylor et al. (2007). Haplotype relative risk estimation in epidemiological studies; New methodology applied to a study of smoking, relevant detoxification genes and oral clefts in Norway. (external link)
• Sturla Eik-Nes; HG Blaas; Per Grøttum et al. (2007). Predicting remaining time of pregnancy - a new population-based approach for the prediction of day of delivery based on Femur length. (external link)
• Inger Økland; Håkon K. Gjessing; Per Grøttum et al. (2007). A new population-based term prediction method-evaluation of the FL-based predictions. (external link)
• Inger Økland; Håkon K. Gjessing; Per Grøttum et al. (2007). A new population-based term prediction method-evaluation of the BPD-based predictions. (external link)
• Rolv Terje Lie; Håkon K. Gjessing; J Taylor et al. (2007). Haplotype relative risk estimation in epidemiological studies; New methodology applied to a study of smoking, relevant detoxification genes and oral clefts in Norway. (external link)

Conference lecture

• Torbjørn Moe Eggebø; Olav-Andre Klefstad; Inger Økland et al. (2016). Prenatal detection of low birthweight in pregnancies past term. (external link)
• Torbjørn Moe Eggebø; Olav-Andre Klefstad; Inger Økland et al. (2016). Estimation of fetal weight in pregnancies past term. (external link)
• Torbjørn Moe Eggebø; Olav-Andre Klefstad; Inger Økland et al. (2016). Prenatal detection of macrosomia in pregnancies past term. (external link)
• Tor A Strand; Sunita Taneja; Nita Bhandari et al. (2005). Folate, but not cobalamin status predicts respiratory morbidity in north Indian children. (external link)
• Håkon K Gjessing (2001). Frailty as a stochastic process. (external link)
• Stein Atle Lie; LB Engesæter; LI Havelin et al. (1999). Patient mortality after total hip replacement - follow-up of 35938 patients in the Norwegian Arthroplasty Register. (external link)
• SA Lie; LB Engesæter; LI Havelin et al. (1999). Mortality after total hip replacement. 10 years follow-up of 39453 patients in the Norwegian Arthroplasty Register. (external link)
• Kari Klungsøyr. Melve; Håkon Gjessing; Rolv Skjærven (1998). Perinatal mortality and infants' length at birth. (external link)
• Rolv Terje Lie; Håkon Gjessing (1998). Distinguishing maternal and fetal contributions to birth weight using half-sib data. (external link)
• Rolv Terje Lie; Svein Rasmussen; H. Brunborg et al. (1997). Føtalt og maternelt bidrag til risiko for preeklampsi. (external link)
• Rolv Terje Lie; Svein Rasmussen; H. Brunborg et al. (1997). Føtalt og maternelt bidrag til risiko for preeklampsi. (external link)
• Rolv Skjærven; Håkon Gjessing; Gunnar Dalseth et al. (1997). New standards for birth weight by gestational age using family data. (external link)
• Håkon Gjessing; R. Skjærven; Allen J. Wilcox (1997). Svangerskapsvarigheter og fødselsvekter, noe for en statistiker?. (external link)
• Håkon Gjessing; R. Skjærven; Allen J. Wilcox (1997). Svangerskapsvarigheter og fødselsvekter, noe for en statistiker?. (external link)
• Håkon Gjessing; R. Skjærven; Allen J. Wilcox (1997). Errors in gestational age. A somewhat different analysis of errors in computed length of gestation, using birth weight as reference. (external link)
• Håkon Gjessing; R. Skjærven; Allen J. Wilcox (1997). Errors in gestational age. A somewhat different analysis of errors in computed length of gestation, using birth weight as reference. (external link)
• Håkon Gjessing; R. Skjærven; Allen J. Wilcox (1997). Errors in gestational age. A somewhat different analysis of errors in computed length of gestation, using birth weight as reference. (external link)
• Håkon Gjessing; R. Skjærven; Allen J. Wilcox (1997). Svangerskapsvarigheter og fødselsvekter, noe for en statistiker?. (external link)
• Rolv Terje Lie; Svein Rasmussen; H. Brunborg et al. (1997). Føtalt og maternelt bidrag til risiko for preeklampsi. (external link)
• Håkon Gjessing (1996). A variation of parameters solution of a quasi-linear Skorohod stochastic differential equations using the Wick product. (external link)

Conference poster

• Viktoria Hecimovic; Karoline Hansen Skåra; Håkon K. Gjessing et al. (2026). Is being born small for gestational age associated with epigenetic age acceleration in mothers from the Norwegian Mother, Father and Child Cohort Study?. (external link)
• Yunsung Lee; Miriam Gjerdevik; Astanand Jugessur et al. (2023). Parent-of-origin effects on childhood asthma. (external link)
• Håkon Kristian Gjessing; Miriam Gjerdevik; Julia Romanowska et al. (2023). Family-based methods to identify genes implicated in infertility and fetal viability. (external link)
• Dinka Smajlagic; Stella Tsotsi; Miriam Gjerdevik et al. (2022). Parent-of-origin effects in childhood aggression. (external link)
• Julia Romanowska; Håkon K. Gjessing; Inge Jonassen et al. (2015). Haplin — a powerful tool for studying gene-environment interactions. (external link)
• Jannicke Igland; Stein Emil Vollset; Ottar Nygård et al. (2010). Relative importance of risk factors for cardiovascular disease incidence and mortality: a prospective cohort study. (external link)

Doctoral thesis (PhD)

• Siri Nærland Skodvin; Håkon K. Gjessing; Miriam Gjerdevik et al. (2025). Family-based statistical modeling of genetic effects on infertility and early fetal viability. (external link)
• Håkon Gjessing (1995). Anticipating calculus and wick products. (external link)

Editorial/Leader article

• Håkon K. Gjessing; Hans J. Skaug (2019). Editorial. (external link)
• Ørnulf Borgan; Håkon K. Gjessing (2019). Special issue dedicated to Odd O. Aalen. (external link)
• Siri Eldevik Håberg; Lill Trogstad; Nina Gunnes et al. (2013). Risk of Fetal Death After Pandemic Influenza Virus Infection or Vaccination EDITORIAL COMMENT. (external link)

Lecture

• Håkon Gjessing (1997). Blødninger tidlig i svangerskapet; farligere enn tidligere antatt?. (external link)

Letter to the editor

• Maria Christine Magnus; Håkon K. Gjessing; Helena Niemi Eide et al. (2021). Covid-19 vaccination during pregnancy and first-trimester miscarriage. (external link)
• Håkon K. Gjessing; Per Grøttum; Inger Økland et al. (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. (external link)
• Håkon K Gjessing; Per Grøttum; Inger Økland et al. (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. (external link)
• Håkon K Gjessing; Per Grøttum; Sturla H Eik-Nes (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. (external link)
• Håkon K. Gjessing; Per Grøttum (2007). Accuracy of second trimester fetal head circumference and biparietal diameter for predicting the time of spontaneous birth. (external link)
• Sturla Eik-Nes; Per Grøttum; Håkon K. Gjessing (2006). Regarding "Term prediction with ultrasound: evaluation of a new dating curve for biparietal diameter". (external link)
• Sturla Eik-Nes; Per Grøttum; Håkon K. Gjessing (2006). Regarding "Term prediction with ultrasound: evaluation of a new dating curve for biparietal diameter". (external link)

Master’s thesis

• Håkon Gjessing (1990). Some convergence results for ITO diffusions and optimal stopping. (external link)

Popular science article

• Håkon K. Gjessing; Christine Steiro; Georg Becher et al. (2006). Redusert analytisk tilgjengelighet for PCB i humusfarget vann. (external link)

Professional article

• Tuowei Li; Trevor A Pickering; Brendan H Grubbs et al. (2026). Association of STOX1 Maternal and Fetal Polymorphisms with Hypertensive Disorders of Pregnancy: Preliminary Evidence for a Parent-of-Origin Effect and Maternal-Fetal Genotypic Interaction. (external link)

Research report

• Stein Emil Vollset; randi selmer; Aage Tverdal et al. (2006). Hvor dødelig er røyking? Rapport om dødsfall og tapte leveår som skyldes røyking. (external link)
• Stein Emil Vollset; Randi Marie Selmer; Aage Tverdal et al. (2006). Hvor dødelig er røyking? Rapport om dødsfall og tapte leveår som skyldes røyking. (external link)
• Håkon K. Gjessing; Odd O. Aalen; Nils Lid Hjort (2003). Frailty models based on Lévy processes. (external link)
• Håkon K. Gjessing (1994). Integral conditions for Skorod stochastical differential equations. (external link)
• Håkon K. Gjessing (1993). A note on the Wick product. Report No.23 March 1993. (external link)

See a complete overview of publications in NVA.