The baseline point prevalence of hypertension in African-American women aged 45-

Question

The baseline point prevalence of hypertension in African-American women aged 45-64 years included in the Atherosclerosis Risk in Communities (ARIC) surveillance study was found to be 53%. In this study, over a follow-up period of 7 years, the average yearly incidence of hypertension in African-American women was estimated to be about 5%, which was stable over the years. Using these data, estimate the average duration of hypertension in African American women in the ARIC study. (Hint: use the relationship between prevalence and incidence).

Explanation / Answer

Prevalence tackles the existence of a disease/disorder at particular period in time.

Incidence tackles the addition of novel cases to the population.

Average duration = Prevalence/Incidence

Average duration = 53%/5%

= 10.6 years

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