Larger sample sizes give more precise confidence intervals
| Sample size (each group) | Estimated reduction in blood pressure | 95% confidence interval |
|---|---|---|
| 50 | 6 mm Hg | −1.0 to 13.0 mm Hg |
| 100 | 6 mm Hg | 1.1 to 10.9 mm Hg |
| 200 | 6 mm Hg | 2.5 to 9.5 mm Hg |
| 1000 | 6 mm Hg | 5.2 to 6.8 mm Hg |