need help with those multiple choice questions. question 12 for the last 2 quest

Question

need help with those multiple choice questions. question 12 for the last 2 questions refers to the second multiple choice question.

A case-control study is conducted to assess the relationship between drinking during the first trimester of pregnancy and miscarriage. One hundred women who suffered miscarriage are enrolled along with 100 who delivered full term. Each participant's use of alcohol during pregnancy is ascertained. Heavy drinking is defined as 4 or more drinks on one occasion. The data are shown below. Calculate the odds ratio of miscarriage for drinking to no drinking. Miscarriage Full-Term Delivery Drinking 28 No Drinking 4.47 0.39 0.09 0.22

Explanation / Answer

Ans:

1)Odds rato=(28/8)/(72/92)=4.47

1)Risk ratio=Risk of stroke in hypertensive condition/Risk of stroke when no hypertension

Risk of stroke in hypertensive condition =180/(2340+180)=0.0714

Risk of stroke when no hypertension=460(9520/460)=0.0461

Relative risk or risk ratio=0.0714/0.0461=1.55

2)

Prevalence of hypertension=(2340+180)/(2340+180+9520+460)=0.202

3)Conditional probability

P(stroke/hypertension)=P(stroke and hypertension)/P(hypertension)=180/(2340+180)=0.071

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