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参考资料：https://mp.weixin.qq.com/s/8rSonJ25vJpeLybUMULmbA

分为2006之前和2007以后，分为MET和TIME。

Physical activity was assessed by metabolic equivalent scores (MET) [9]=vigorous work-related activity*8+moder- ate work-related activity *4+walking or bicycling for transportation*4+vigorous leisure-time physical activ- ity*8 + moderate leisure-time physical activity*4.

22006以前

2007以后