| Reasons for opting out | MSM | Heterosexuals | |
| Standard protocol | Standard protocol | Short protocol | |
| No (%) | No (%) | No (%) | |
| Afraid of test result/not ready yet to be tested | 179 (40) | 216 (36) | 62 (37) |
| Tested before, negative (<3 months) | 32 (7) | 50 (8) | 3 (2) |
| Tested before, negative (>3 months or unknown period) | 95 (21) | 44 (7) | 11 (7) |
| No or low risk estimation for HIV exposure | 52 (12) | 133 (22) | 31 (19) |
| Definitely does not want to be tested without elaborated reason | 18 (4) | 31 (5) | 12 (7) |
| Assumed to be in window period for HIV testing | 16 (4) | 71 (12) | 26 (16) |
| Other reasons | 58 (13) | 61 (10) | 23 (14) |
| Total | 450 | 609 | 168 |
MSM, men who have sex with men; STI, sexually transmitted infection.