Question: A case-cohort study was conducted to examine the association between maternal serum 25-hydroxyvitamin D concentrations during pregnancy and preterm birth within a large cohort of

A case-cohort study was conducted to examine the association between maternal serum 25-hydroxyvitamin D concentrations during pregnancy and preterm birth within a large cohort of pregnant women in the United States.

i wanna which is the right answer when In the analysis of the study, a pregnant woman in the source cohort population at risk can be included:

  1. only as a case.
  2. as both a case and a control.
  3. as a control more than once.

True or False: The same control group could be used to study the effect of maternal serum 25-hydroxyvitamin D concentrations during pregnancy on low birthweight.

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