Oh it's much worse than just confounding. The control group was a sample of school kids taken in the 80s that didn't look at glasses wearing just myopia
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It’s not a study - it’s a letter, hinting that this requires more investigation.
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Regardless of how we define it, I'm not sure what meaning if any can be garnered by comparing rates of myopia in one hospital in Hubei to schoolchildren from the 1980s, which is precisely what this study did
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