The SF-36 subscale scores by BMI categories.

(1) Abbreviations: PF, Physical Functioning; RP, Role Physical; BP, Bodily Pain; GH, General Health; VT, Vitality; SF, Social Functioning; RE, Role Emotional; MH, Mental Health. (2) BMI (kg/m2) categories: Underweight (<18.5); Normal weight (18.5–22.9); Overweight (23–24.9);Class I obese (25–29.9); Class II obese (≥30.0). D, difference mean value. (3) Scores of SF-36 was analyzed by standard least squares adjusted for gender, age, marital status, educational level, exercise habit, use of tobacco and alcohol, districts of residence and chronic conditions. (4) Analysis of Variance was used to get the P value. Dunnett test was applied to analyze the difference between groups. *P<0.01. (5)☂D ≥3 points is regarded as minimum clinically important difference (MCID). The SF-36 subscale scores by BMI categories.