Health Nerd Retweeted Senator Penny Wong
I'd guess the within-family variation (i.e sisters/brothers) is small. It's the between-family variation (i.e. familys with only boys or girls) that I'd guess is where these stats mostly come fromhttps://twitter.com/SenatorWong/status/1001279416570265605 …
Health Nerd added,
6:58 PM - 28 May 2018
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