One subtle problem with BMI even at the population level is that it overestimates obesity for tall people and underestimates it for short people -- because the denominator is (height)^2 when the exponent ought to be 3, or maybe 2.5 depending on who you listen to. https://twitter.com/notwokieleaks/status/969694655955677185 …
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Why is this a problem? Two reasons: 1) Height correlates with sex, and sex is an independent correlate of mortality -- men die younger. 2) Height is an independent correlate of mortality _even when you control for sex_ -- tall people die younger.
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.