It wasn't a randomized controlled study and therefore didn't prove causality, just an association between exercise and better mental health. It can't explain if poor mental health causes people to exercise less or exercise causes people to have better mental health.
它并不是一项随机对照研究,因此并不能论证因果关系,只能说明运动与较好的心理健康状况之间存在联系。它也不能解释较差的心理健康状况是否会导致人们减少运动,也无法解释运动能否改善心理健康状况。
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