Different characteristics of the KORA S4 population stratified by quintiles of the serum BCAA^a concentration, given as mean and SD as well as percentage and absolute quantity.

aBCAAs, sum of valine, isoleucine, and leucine; bFat Free Mass Index; cBody Fat Mass Index; dFat Free Mass divided by Body Fat Mass; eSports (active: >1 h leisure time of sports per week on a regular basis; inactive: less than 1 h sports per week).a支链氨基酸（BCAAs）：缬氨酸、异亮氨酸与亮氨酸的含量总和； b无脂质量指数（Fat Free Mass Index）； c体脂质量指数（Body Fat Mass Index）； d无脂质量与体脂质量的比值； e运动状态：规律运动组为每周定期开展≥1小时闲暇体育锻炼，非规律运动组为每周体育锻炼时长不足1小时。