|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|
Estimating treatment effects: real or the result of chance?
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