Question

Managerial Epidemiology Cases & Concepts Third Edition, Steven T. Fleming , Editor

Capstone Case I: Sleep duration and Cardiovascular Disease: A Cross- Sectional Study page 617

Q#3. Exhibit l.1 presents the number of cases and population at risk for various types of CVD. Consider sleeping seven hours per night the unexposed category and all other sleep duration exposed groups. Calculate the prevalence rate(per 100) of each type of CVD by exposure category using exhibit l.1 as a template.

Answer 1

Prevalence rate is the number of ( new + old cases ) in a population at a certain period of time divided by total number of population at the same period of time ×100

Prevalence rate = Number of new and old cases /total number of population ×100

Sleeping 7 hours/ night - unexposed group

All other sleep duration - exposed group

Calculate the prevalence rate per 100

Prevalence rate = all new and old cases of different types of CVD ( exposed group ) / Total number of population at the same time period × 100