An investigation was undertaken to determine if there is an association between

Question

An investigation was undertaken to determine if there is an association between cigarette smoking during pregnancy and abortion. Women were interviewed shortly after the spontaneous abortion of their pregnancies, and were matched by age and economic status with control women who delivered a live birth of greater than 28 weeks gestation. The results were as follows: Based on the results shown above and assuming that the results are statistically significant, which of the following measures best estimates the association of smoking 1-19 cigarettes per day (versus none) with abortion in these women? 1.58 2.22 1.81 0.45 Cannot be calculated based on the data provided

Explanation / Answer

the best estimates the association of smoking 1-19 cigarettes per day ( versus none)

with abortion in these women is

88/ 239 = 0.368 but the answer is not in the options so we can round to the closer option that is 0.45

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