100 women were surveyed for oral contraceptive pill usage for 24 months, out of which 10 became pregnant. Calculate the pearl index?
Correct Answer: 5
Description: Ref. Foundations of Community medicine. Page.117
Pearl Index
It measures the contraceptive efficacy.
It is defined as the number of failures per 100 woman years of exposure
This rate is given by the formula = Total accidental pregnancies * 1200
Number of women * Number of month
Pearl Index = 10 × 12 × 100 / 100 × 24 = 5
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