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Table 2 Achieved power for differences in outcomes ranging from 15 to 20%

From: Study design and protocol of a stepped wedge cluster randomized trial using a practical implementation strategy as a model for hypertension-HIV integration — the MAP-IT trial

ICC

At baseline (no PF): 50%

At baseline (no PF): 40%

Difference: 15%

Odds ratio: 1.9

Difference: 20%

Odds ratio: 2.3

Difference: 15%

Odds ratio: 1.8

Difference: 20%

Odds ratio: 2.2

0.01

82%

97%

84%

98%

0.03

79%

96%

80%

96%

0.05

77%

95%

78%

96%

  1. Assume 5% two-sided type 1 error, K = 30, m = 25 (after accounting for 10% attrition, m = 28 at time of recruitment)
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Implementation Science

ISSN: 1748-5908