Nondrinkers or heavy drinkers

Reference no: EM131032388

The Nurses' Health Study has interviewed a sample of more than 100,000 female registered nurses every two years since 1976. The study finds that "light-to-moderate drinkers had a significantly lower risk of death" than either nondrinkers or heavy drinkers. The Nurses' Health Study is

(a) an observational study.

(b) an experiment.

Reference no: EM131032388

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