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Stratified analyses of the causal associations of body mass index (BMI) with all osteoarthritis (OA). Odds ratios (ORs) and 95% confidence intervals are shown for the causal associations between BMI (per SD increase) and the risk of all OA, as determined using the 2‐sample Mendelian randomization inverse‐variance weighting method in analyses stratified by age (median of cases), sex, current smoking status, or type 2 diabetes.
