Were gay couples counted twice in the PARTNER 1 and 2 studies?
I was looking at the results from the PARTNER 1 and 2 studies and trying to see how gay couples were counted in each study. Were some of the 77,000 times that gay couples had sex in PARTNER 2 also counted in PARTNER 1?
Thanks for your question.
The PARTNER 1 and 2 studies produced the most complete evidence for how well HIV treatment prevents sexual HIV transmission.
PARTNER 1 reported zero transmissions after almost 900 couples had sex almost 58,000 without condoms. Approximately two-thirds of couples were straight and one-third were gay men.
PARTNER 2 reported zero transmissions after almost 800 gay couples had sex almost 77,000 times.
However, 22,000 times that gay couples had sex in PARTNER 2 were also counted in the PARTNER 1 results.
Combining results from both PARTNER 1 and 2 included 113,000 times people had sex without condoms: gay couples had sex 77,000 times and straight couples had sex 36,000 times.
This page links to detailed reports of both studies: