I would think this study with suffer from a pretty obvious case of the hawthorne effect: https://en.wikipedia.org/wiki/Hawthorne_effect https://en.wikipedia.org

I would think this study with suffer from a pretty obvious case of the hawthorne effect: https://en.wikipedia.org/wiki/Hawthorne_effect https://en.wikipedia.org/wiki/Hawthorne_effect And a sample size orders of magnitude higher would be necessary to negate that, or even be significant to a "universal" scale.