The sample size calculated was 870, which is true for a baseline percentage of 10%. However, we want the baseline to be 15% (yielding n=510), which is the only known variable within our study. The percentages given in the question may have led to some confusion, but it is best to retrieve a sample size using known data.
The sample size calculated was 870, which is true for a baseline percentage of 10%. However, we want the baseline to be 15% (yielding n=510), which is the only known variable within our study. The percentages given in the question may have led to some confusion, but it is best to retrieve a sample size using known data.