Table 1
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