An investigator wanted to determine whether vitamin deficiency was associated wi

Question

An investigator wanted to determine whether vitamin deficiency was associated with birth defects. By reviewing the birth certificates during a single year in a large U.S. county, the researcher located all 200 infants born with neural tube defects (NTDs). A total of 600 other births were selected at random from the certificates. Mothers were given a dietary questionnaire. Among mothers who gave birth to an infant with an NTD, 80 reported no use of supplementary vitamins; a total of 160 control mothers did not use a vitamin supplement.

Which of the following biases or procedures is most likely to affect this study design?

A. Selection bias

B. Information bias

C. Randomization bias

D. Differential follow-up bias

Explanation / Answer

I think it is deferential follow up bias

Because in this situation we are selecting mother and giving them different kind of nutrients to observe the change

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