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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