Some of you asked me for more info on this theme. Here’s a write-up of a study done some years ago. Also a video summary of some of the same information. (and here’s the actual study). Here’s another more recent piece citing some other research on this. I don’t know if anything else along the lines of the big 2012 study has been done in the past 7 years, but I don’t see any obvious reasons to suspect that the trend has reversed recently.
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