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Re:Association between physical exercise and mental health: ... by tryitnow on Friday August 10, 2018 @05:10PM (#17736766)
Thanks for providing this study.

This reminds me of the Iron Law of Evaluation:

https://www.gwern.net/docs/sociology/1987-rossi

The Iron Law refers social program interventions but I think it is applicable to a lot of health interventions too.

https://www.gwern.net/docs/sociology/1987-rossi

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