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Table 3 Sample sizes at different non-inferiority marginsa

From: Reducing provider workload while preserving patient safety via a two-way texting intervention in Zimbabwe’s voluntary medical male circumcision program: study protocol for an un-blinded, prospective, non-inferiority, randomized controlled trial

Non-inferiority margin

AE proportion cutoff for 2wT non-inferiority

Sample size (number per arm)

0.6%

1% AEs or less

2326

1.6%

2% AEs or less

328

2.6%

3% AEs or less

124

  1. 2wT two-way texting, AE adverse event
  2. aUsing ssi command from STATA 12.0 for one-sided, non-inferiority
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ISSN: 1745-6215