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All reasonable fitness trackers use your weight as an input, and there's nothing in the article to suggest the devices weren't provided with this information ev

• kqr 2y ago
  That's what I'm saying. If we're discussing an r² of 70 % on a population level they don't need to track anything to achieve that, just use the weight. So before we can say whether 70 % is good or bad we need to know more about what those 70 % actually mean.