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Table 1 Serodiscordant couples sample size calculations

From: The Opposites Attract Study of viral load, HIV treatment and HIV transmission in serodiscordant homosexual male couples: design and methods

Percentage of HIV men who are on ART and have undetectable BPVL Reduction in HIV incidence in HIV-negative men with partners with undetectable BPVL Required number of HIV seroconversion events Total sample size required
60% 0.75 18 631
  0.85 11 436
  0.95 7 305
70% 0.75 15 624
  0.85 9 413
  0.95 5 272
80% 0.75 14 692
  0.85 7 429
  0.95 4 256
90% 0.75 17 1008
  0.85 7 563
  0.95 3 276