Gel efficacy against HIV-1 transmission did not differ between centres (p=0·19 for interaction), or between consistent (HR 0·97, 95% CI 0·87–1·35, p=0·87) and inconsistent (1·17, 0·42–1·72, p=0·42) gel users (p=0·47 for interaction).
0·5% PRO2000 gel
Placebo gel
HIV-1 incidence