Prospective Cohort Sample Size. Select Cohort or cross sectional. 80 Ratio of sample size UnexposedExposed.
Lesson 9 Cohort Study Design Sample Size And Power Considerations For Epidemiologic Studies from online.stat.psu.edu
From the Epi Info main page select StatCalc. As part of that article an online calculator has been developed to help readers to perform the sample size estimation for cohort. A general discussion about sample size determination is presented in the article by Wang and Ji 19 included in this supplemental issue of CHEST.
Select the Two-sided confidence level of 95 from the drop-down list.
Two study groups will. In general large prospective cohort studies are doing well if they can maintain follow-up of 80-90 of their sample for long periods. The Cohort or Cross-Sectional window opens. The required sample size was 246.
