Hopper J

Education in Twins and Their Parents Across Birth Cohorts Over 100 years: An Individual-Level Pooled Analysis of 42-Twin Cohorts

Silventoinen K, Jelenkovic A, Hopper JL, Busjahn A, Cozen W, Mack TM, Sumathipala A, Harris JR, Goldberg JH, Harden KP, Duncan GE, Buchwald D, Turkheimer E, Kaprio J, et al. Whether monozygotic (MZ) and dizygotic (DZ) twins differ from each other in a variety of phenotypes is important for genetic twin modeling and for inferences […]

Differences in genetic and environmental variation in adult body mass index by sex, age, time period, and region: an individual-based pooled analysis of 40 twin cohorts

Silventoinen K, Jelenkovic A, Cozen W, Mack T, Sumathipala A, Christensen K, Busjahn A, Duncan GE, Buchwald D, Goldberg JH, Hopper JL, Sung J, Turkheimer E, Kaprio J, et al. Background  Genes and the environment contribute to variation in adult body mass index [BMI (in kg/m2)], but factors modifying these variance components are poorly understood. […]

Does the sex of one’s co-twin affect height and BMI in adulthood? A study of dizygotic adult twins from 31 cohorts

Bogl LH, Jelenkovic A, Christensen K, Cozen W, Mack TM, Duncan GE, Buchwald D, Hopper JL, Silventoinen K, Kaprio J, et al. Background The comparison of traits in twins from opposite-sex (OS) and same-sex (SS) dizygotic twin pairs is considered a proxy measure of prenatal hormone exposure. To examine possible prenatal hormonal influences on anthropometric […]

Genetic and environmental influences on adult human height across birth cohorts from 1886 to 1994

Jelenkovic A, Sumathipala A, Christensen K, Hopper JL, Cozen W, Mack TM, Sung J, Duncan GE, Buchwald D, Harris JR, Goldberg JH, Kaprio J, Silventoinen K, et al. Human height variation is determined by genetic and environmental factors, but it remains unclear whether their influences differ across birth-year cohorts. We conducted an individual-based pooled analysis […]

Genetic and environmental influences on height from infancy to early adulthood: An individual-based pooled analysis of 45 twin cohorts

Jelenkovic A, Craig JM, Sumathipala A, Harden KP, Cozen W, Mack TM, Hopper JL, Duncan GE, Buchwald D, Sung J, Harris JR, Busjahn A, Goldberg JH, Kaprio J, Silventoinen K, et al. Height variation is known to be determined by both genetic and environmental factors, but a systematic description of how their influences differ by sex, age and […]

Zygosity Differences in Height and Body Mass Index of Twins From Infancy to Old Age: A Study of the CODATwins Project

Jelenkovic A, Craig JM, Sumathipala A, Harden KP, Cozen W, Mack TM, Hopper JL, Duncan GE, Buchwald D, Sung J, Harris JR, Busjahn A, Goldberg JH, Kaprio J, Silventoinen K, et al. A trend toward greater body size in dizygotic (DZ) than in monozygotic (MZ) twins has been suggested by some but not all studies, and this difference […]

The CODATwins Project

The Cohort Description of Collaborative Project of Development of Anthropometrical Measures in Twins to Study Macro-Environmental Variation in Genetic and Environmental Effects on Anthropometric Traits Silventoinen K, Craig JM, Sumathipala A, Harden KP, Cozen W, Mack TM, Hopper JL, Duncan GE, Buchwald D, Sung J, Harris JR, Busjahn A, Goldberg JH, Kaprio J, et al. […]

International Network of Twin Registries (INTR): Building a Platform for International Collaboration.

Buchwald D, Kaprio J, Hopper J, Sung J, Goldberg J, Fortier I, Busjahn A, Sumathipala A, Cozen W, Mack T, Craig J, Harris J The International Network of Twin Registries (INTR) aims to foster scientific collaboration and promote twin research on a global scale by working to expand the resources of twin registries around the […]