Question: Smoking has been shown to be a risk factor for LBW newborns with an OR of about 2 . 0 . Suppose that you want

Smoking has been shown to be a risk factor for LBW newborns with an OR of about 2.0. Suppose that you want to engage in a nested case control study with 450 cases of mothers with LBW newborns and 500 controls (mothers with normal weight infants). Since your study is nested within an ongoing cohort study, you have access to both urine and serum samples from these women.

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