A five year prospective cohort study has just been completed The study was designed to assess the association between supplemental vitamin A exposure and mortality and morbidity for measles The relative risk (RR) for incidence of measles was 0 75 and the RR for measles mortality was 0 5 in vitamin users versus nonusers Assume these RRs are statistically significant

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A five year prospective cohort study has just been completed  The study was designed to assess the association between supplemental vitamin A exposure and mortality and morbidity for measles  The relative risk (RR) for incidence of measles was 0 75 and the RR for measles mortality was 0 5 in vitamin users versus nonusers  Assume these RRs are statistically significant

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Question: A five-year prospective cohort study has just been completed. The study was designed to assess the association between supplemental vitamin A exposure and mortality and

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