A researcher examined the association between dietary sodium intake and mortalit

Question

A researcher examined the association between dietary sodium intake and mortality, incident cardiovascualr disease (CVD) and incident heart failure (HF) in older adults. The researcher analyzed a 10 year follow up from 2642 older adults (age range, 71-80 years) participating in a community-based, one year, prospective cohort study. Dietary sodium intake at baseline was assessed by a food requency questionaire. The reasearcher examined sodium intake at the following levels: less than 1500 mg/d (291 participants (11.0 percent), 1500 to 2300 mg/d (779 participants (29.5%), and greater than 2300 mg/d (1572 participants (59.5 percent)/ No consistent interactions with sex race or hypertensive status were observed for any outcome. Why should the researcher avoid using this data? Please explain the answer in detail. 1) Participants were placed in the wrong age range. 2) Study sample population size was inappropriate. 3) Sodium intake was difficult to assess. 4) Study time length was set incorrectly.

Explanation / Answer

Study sample population size was inappropriate. There is disproportionate hgh nmber of participants in the greater than 2300 mg/d range. This can read to false results. Sample for the analysis should be unbiased and almost equal in size because standard deviation is inversely proportional to sample size.

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