Couldn't there be countless other differences due to environment, food, culture,...

		colordrops on Nov 2, 2022 \| parent \| context \| favorite \| on: Associations between alcohol consumption and gray ... Couldn't there be countless other differences due to environment, food, culture, genetics, etc that would be hard to separate? I'm no scientist but I was under the impression that the control group should be as close as possible a cohort other than what is being tested.