Evid Based Nurs 3:36-39 doi:10.1136/ebn.3.2.36

Estimating treatment effects: real or the result of chance?

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

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