A five-year prospective cohort study has just been completed. The study was desi

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 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.

Regarding the RR reported above, which statement is correct?

Exposure to vitamin A appears to protect against morbidity and mortality for measles.

Exposure to vitamin A appears to be a risk factor for morbidity and mortality for measles.

Exposure to vitamin A is not associated with morbidity and mortality for measles.

Exposure to vitamin A is a risk factor for morbidity and a protective factor for mortality for measles.

Exposure to vitamin A appears to protect against morbidity and mortality for measles.

Exposure to vitamin A appears to be a risk factor for morbidity and mortality for measles.

Exposure to vitamin A is not associated with morbidity and mortality for measles.

Exposure to vitamin A is a risk factor for morbidity and a protective factor for mortality for measles.

Explanation / Answer

RR for incidence of measles is 0.75 which means that there are 0.75 incidents in the vitamin users per every 1 incident in the non user.

Whereas RR for measles mortality is 0.5 which means that there are 0.5 incidents in vitamin users per every 1 incident in the non user.

Hence Exposure to Vitamin A is good for measles mortality but not for morbidity

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