A within-sibling pair analysis of lifestyle behaviours and BMI z-score in the multi-centre I.Family study

Background and aims By investigating differences in lifestyle behaviours and BMI in sibling pairs, family-level confounding is minimized and causal inference is improved, compared to cross-sectional studies of unrelated children. Thus, we aimed to investigate within-sibling pair differences in different lifestyle behaviours and differences in BMI z-scores in children and adolescents. Methods and results We examined three groups of sibling pairs...