Huge meta-analysis of BMI twin studies finds increasing H2 with age (Wilson effect) setling at 75% by adulthood. https://www.researchgate.net/publication/305343105_Genetic_and_environmental_effects_on_body_mass_index_from_infancy_to_the_onset_of_adulthood_an_individual-based_pooled_analysis_of_45_twin_cohorts_participating_in_the_COllaborative_project_of_Develop …
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Yup I've seen similar studies before. Factor in measurement error you get H nearer to 80-85%.
can you find estimates of test retest reliability? It's complicated because BMI is nonlinear function of height and weight.
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Adult height is much less variable, and that term is only squared in BMI.
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