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 |