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 traits, we compared mean height, body mass index (BMI), and the prevalence of being overweight or obese between men and women from OS and SS dizygotic twin pairs.
Methods: The data were derived from the COllaborative project of Development of Anthropometrical measures in Twins (CODATwins) database, and included 68,494 SS and 53,808 OS dizygotic twin individuals above the age of 20 years from 31 twin cohorts representing 19 countries. Zygosity was determined by questionnaires or DNA genotyping depending on the study. Multiple regression and logistic regression models adjusted for cohort, age, and birth year with the twin type as a predictor were carried out to compare height and BMI in twins from OS pairs with those from SS pairs and to calculate the adjusted odds ratios and 95% confidence intervals for being overweight or obese.
Results: OS females were, on average, 0.31 cm (95% confidence interval (CI) 0.20, 0.41) taller than SS females. OS males were also, on average, taller than SS males, but this difference was only 0.14 cm (95% CI 0.02, 0.27). Mean BMI and the prevalence of overweight or obesity did not differ between males and females from SS and OS twin pairs. The statistically significant differences between OS and SS twins for height were small and appeared to reflect our large sample size rather than meaningful differences of public health relevance.
Conclusions: We found no evidence to support the hypothesis that prenatal hormonal exposure or postnatal socialization (i.e., having grown up with a twin of the opposite sex) has a major impact on height and BMI in adulthood.
Bogl LH, Jelenkovic A, Vuoksimaa E, Ahrenfeldt L, Pietiläinen KH, Stazi MA, Fagnani C, D’Ippolito C, Hur YM, Jeong HU, Silberg JL, Eaves LJ, Maes HH, Bayasgalan G, Narandalai D, Cutler TL, Kandler C, Jang KL, Christensen K, Skytthe A, Kyvik KO, Cozen W, Hwang AE, Mack TM, Derom CA, Vlietinck RF, Nelson TL, Whitfield KE, Corley RP, Huibregtse BM, McAdams TA, Eley TC, Gregory AM, Krueger RF, McGue M, Pahlen S, Willemsen G, Bartels M, van Beijsterveldt TCEM, Pang Z, Tan Q, Zhang D, Martin NG, Medland SE, Montgomery GW, Hjelmborg JVB, Rebato E, Swan GE, Krasnow R, Busjahn A, Lichtenstein P, Öncel SY, Aliev F, Baker LA, Tuvblad C, Siribaddana SH, Hotopf M, Sumathipala A, Rijsdijk F, Magnusson PKE, Pedersen NL, Aslan AKD, Ordoñana JR, Sánchez-Romera JF, Colodro-Conde L, Duncan GE, Buchwald D, Tarnoki AD, Tarnoki DL, Yokoyama Y, Hopper JL, Loos RJF, Boomsma DI, Sørensen TIA, Silventoinen K, Kaprio J. Does the sex of one’s co-twin affect height and BMI in adulthood? A study of dizygotic adult twins from 31 cohorts. Biol Sex Differ. 2017 Apr 27;8:14. PMC5408365.