Baseline characteristics according to weight status.

Weight status as determined by Body Mass Index (BMI ≥30); acomparison between obese and non-obese based on chi-square test; bcomparison between obese and non-obese based t-test, cnumber of diseases weighted by severity; dvisual analogue scale.以身体质量指数（Body Mass Index，BMI）≥30判定的体重状态； a. 基于卡方检验（chi-square test）的肥胖组与非肥胖组对比分析； b. 基于t检验（t-test）的肥胖组与非肥胖组对比分析； c. 经严重程度加权的疾病计数； d. 视觉模拟评分法（visual analogue scale）。