Cats protect from cardiovascular disease?
>>The researchers performed multivariate analyses on risk factors for heart disease in these patients, adjusting for differences in age, gender, ethnicity/race, systolic blood pressure, cigarette smoking, diabetes mellitus, serum cholesterol and body mass index.<<
Clearly there's a lot of things they didn't adjust for. Could it be that cat owners are on average richer and more highly educated, for example, thereby having better access to health care and being more likely to make wise healthcare-related decisions?
They may eat more fish and drink more wine as well.
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