Doctoral dissertation

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

Academic article

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

Poster

• Lee, Yunsung; Gjerdevik, Miriam; Jugessur, Astanand et al. (2023). Parent-of-origin effects on childhood asthma. (external link)
• Gjessing, Håkon Kristian; Gjerdevik, Miriam; Romanowska, Julia et al. (2023). Family-based methods to identify genes implicated in infertility and fetal viability. (external link)
• Smajlagic, Dinka; Tsotsi, Stella; Gjerdevik, Miriam et al. (2022). Parent-of-origin effects in childhood aggression. (external link)
• Romanowska, Julia; Gjessing, Håkon K.; Jonassen, Inge et al. (2015). Haplin — a powerful tool for studying gene-environment interactions. (external link)
• Igland, Jannicke; Vollset, Stein Emil; Nygård, Ottar et al. (2010). Relative importance of risk factors for cardiovascular disease incidence and mortality: a prospective cohort study. (external link)

Reader opinion piece

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

Editorial

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

Academic lecture

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

Academic monograph

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

Popular scientific article

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

Report

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

Academic chapter/article/Conference paper

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

See a complete overview of publications in Cristin.