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Paediatric obesity appears to lower the risk of diabetes if selection bias is ignored.

Steven D StovitzHailey R BanackJay S Kaufman
Published in: Journal of epidemiology and community health (2018)
Healthy weight was associated with a 4-13 times higher relative risk of diabetes mellitus compared with being obese. While apparently shocking, the study's fatal flaw (selection bias) explains the 'paradoxical' finding. Ignoring selection bias can delay advances in medical science.
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