OK, results like this may be effect of uncontrolled confounding.
Maximilian de Courten, Assoc Prof Clin Epidemiology:
A recent paper in the Am J Prev Med tried to estimate the impact of uncontrolled confounding looking at differences of 30 known cardiovascular disease (CVD) factors between moderate drinkers and nondrinkers and demonstrated that 90% of them were more prevalent among nondrinkers. In addition, among factors with multiple risk strata, increasing CVD risk was progressively associated with nondrinking status. There is no reason to believe that this difference should only be limited to abstainers, but not apply to some extent to the whole spectrum of (reduced) drinking behaviour – hence excluding abstainers from analyses would not remove uncontrolled confounding from the findings.
Cardiovascular risk factors and confounders among nondrinking and moderate-drinking U.S. adults. Am J Prev Med 2005; 28: 369-73Study
tl:dr Non-drinkers have overall poor health status due to non-related conditions.
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