Table 4 Sample size estimates to detect various differences in mean changes of systolic BP between African Americans and Whites using a one-sided t-tests with alpha = 0.05 and standard deviation of change =16 mmHg
Power (1-Beta) | Sample size - African Americans | Sample size - Whites | Difference in mean changes of SBP between two races |
|---|---|---|---|
0.80027 | 792 | 792 | 2.0 |
0.80033 | 507 | 507 | 2.5 |
0.80023 | 352 | 352 | 3.0 |
0.80125 | 260 | 260 | 3.5 |
0.80086 | 199 | 199 | 4.0 |
0.80002 | 157 | 157 | 4.5 |
0.80193 | 128 | 128 | 5.0 |