Clinical characteristics of HBS and PROBE study participants.

BMI is body mass index, N is normal, OW is overweight and OB is obese. BMI was defined by standard measures as normal (N) = 18.5–24.9, overweight (OW) = 25–29.9 and obese (OB) = 30 or greater.BMI即身体质量指数（Body Mass Index），其中N代表正常，OW代表超重，OB代表肥胖。经规范测量定义的BMI分类标准如下：正常（N）为18.5–24.9，超重（OW）为25–29.9，肥胖（OB）为30及以上。