Enter only numbers into your answer. Round to two decimal places after completin
ID: 78896 • Letter: E
Question
Enter only numbers into your answer. Round to two decimal places after completing mathematical operations. Round to two significant digits. Place a leading 0 in front of the decimal if you answer is not a whole number.
Part A:
You are conducting a cohort study of low birth weight in babies after a non-eventful pregnancy. You are interested in examining numerous variables including sex of the baby and mothers drinking status during pregnancy. Below is a table showing the association between sex of the baby and low birth weights.
1. Calculate the incidence of low birth weight in female babies Blank 1
2. Calculate the incidence of low birth weight in male babies Blank 2
3. Calculate crude relative risk of being low birth weight if the baby is female. Blank 3
Low Birth Weight
Normal Birth Weight
Total
Female Babies
85
259
344
Male Babies
59
219
278
Total
144
478
622
Low Birth Weight
Normal Birth Weight
Total
Female Babies
85
259
344
Male Babies
59
219
278
Total
144
478
622
Explanation / Answer
Answer 1: 76.8% (As explained below)
Incidence of low birth weight in female babies = (478 x 100) / 622 = 76.8 %
Answer 2: 23.1% (As explained below)
Incidence of low birth weight in male babies = (144 x 100) / 622 = 23.1%
Answer 3: 24.7 (As explained below)
Crude relative risk of being low birth weight if the baby is female = (85 x 100) / 344 = 24.7%
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