Question

The incidence rate of postpartum depression among 250,000 women who recently experienced a pregnancy was 12 cases per 100,000 woman-years of follow-up. exactly how many incident cases of postpartum depression developed in this population?

Answer 1

To find the number of incident cases of postpartum depression, we set up a proportion using the given incidence rate and total woman-years of follow-up. The result is 30 incident cases in the population.

Step-by-step explanation:

To find the number of incident cases of postpartum depression, we need to calculate the total number of woman-years of follow-up for the given population. Since the incidence rate is given as 12 cases per 100,000 woman-years, we can set up a proportion to find the number of incident cases:

12 cases / 100,000 woman-years = x cases / 250,000 woman-years

Cross multiplying, we get: 12 * 250,000 = 100,000 * x

Simplifying, we get: 3,000,000 = 100,000 * x

Dividing both sides by 100,000, we find that x = 30

Therefore, there were 30 incident cases of postpartum depression in this population.