Hazard ratios (95% CI) for stroke according to WHO categories of BMI.

CI, confidence interval; WHO, World Health Organization; BMI, body mass index;†Model 1 was stratified by hospitals, and adjusted for age and sex.‡Model 2 was stratified by hospitals, and adjusted for age, sex, average monthly income of each family member, education level, marital status, smoking status, drinking status, and physical activity.§Model 3 was stratified by hospitals, and adjusted for age, sex, average monthly income of each family member, education level, marital status, smoking status, drinking status, physical activity, history of hypertension, diabetes mellitus, and dyslipidemia.