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

Table 1 Serodiscordant couples sample size calculations

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

ISSN: 1471-2458