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Comparison of twin- (solid black line), GCTA- (dashed line), and PRS-estimated (dotted line) heritability of BMI-SDS at age 4 and age 10. The variance explained by genetic effects increased from age 4 to age 10, using all three methods. The age-related increase in variance explained was significant for twin-estimated heritability and for the PRS; the GCTA-estimated heritability went from non-significant at age 4 to significant at age 10.
