Which measure of disease frequency best describes the following: the number of healthy, at risk women in the Black Women's Health Study who develop hypertension during 121,600 person-years of follow-up.

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The incidence rate is the measure of disease frequency that describes the number of new cases of a disease (hypertension) occurring in a specified population (healthy, at-risk women) during a specified period of time (121,600 person-years of follow-up).

Which Measure of Disease Frequency Best Describes the Following: the Number