Table 1

 Prevalence of sildenafil and methamphetamine use, and high risk sexual behaviour by substance use during the most recent anal sex encounter of men who have sex with men (n = 388)

Substance use before or during encounter†Sexual risk behaviour during most recent anal sex encounter
UIAURADUIADURA
No (%)No (%)No (%)No (%)
UIA, unprotected insertive anal; URA, unprotected receptive anal.
DUIA, HIV discordant/unknown unprotected insertive anal; DURA, HIV discordant/unknown unprotected receptive anal.
*p<0.01 for 2×2 χ2 test for each substance use variable within columns.
†Substance used before or during the most recent anal sex encounter such that the respondent felt effects during the encounter.
‡Other substance use included alcohol, marijuana, cocaine, crack, LSD/mushrooms, heroin, ecstasy/MDMA, GHB, ketamine, amyl nitrite/poppers, and other substance.
Note: a few cases are missing from analyses because of incomplete data.
Sildenafil (Viagra)
    Yes [24/381 (6%)]14 (61)*11 (48)10 (43)*7 (30)
    No [357/381 (94%)]93 (26)128 (36)32 (9)58 (16)
Methamphetamine
    Yes [59/381 (15%)]14 (24)32 (55)*5 (9)17 (29)*
    No [322/381 (85%)]93 (29)107 (34)37 (12)48 (15)
Other substance‡
    Yes [171/381 (45%)]53 (31)61 (36)22 (13)29 (17)
    No [210/381 (55%)]54 (26)78 (38)20 (10)36 (17)