a. If no one dropped out of the study and no one developed Chlamydia infection during the study period, the total number of person-years = 10,000 person-years (2,000 x 5 years).
<h3>What are person-years?</h3>
Person-years are the product of the number of people in a study and the amount of time each person spends in the study.
Thus, since there are 2,000 women in this study, who spend 5 years each, the person-years are 10,000 (2,000 x 5) person-years.
b. The estimated incidence rate of Chlamydia infection among women who participated in the study is 0.62 or 620 per 1,000 person-years (6,200/10,000).
<h3>What is an incidence rate?</h3>
An incidence rate describes the quickness of disease occurrence in a population. Since the incidence rate is based on person-time, it has some advantages over an incidence proportion, which measures the probability of developing a disease during the specified period.
<h3>Data and Calculations:</h3>
Sample of young women = 2,000
Period of study = 5 years
Subjects newly diagnosed with infection = 440
Total number of person-years of subjects diagnosed = 6,200
Thus, the total number of person-years in the study is <u>10,000 person-years</u>, while the incidence rate is <u>620 per 1,000</u>.
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