Table 3.
HIV serosorting and biomed matching among gay and bisexual men
| Participant’s HIV status | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| HIV-positive and undetectable Group A |
HIV-positive, but detectable (or “I do not know my viral load”) Group B |
HIV-negative, and on PrEP Group C |
HIV-negative, but not on PrEP Group D |
I do not know, or I am unsure Group E |
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| Mdn | IQR | Mdn | IQR | Mdn | IQR | Mdn | IQR | Mdn | IQR | K-W | post hoc | ||
| Total Casual Male Partners < 3 months (Mdn, IQR), valid n = 36411 | 6.0 | 3 to 11 | 5.0 | 2.75 to 15 | 6.0 | 3 to 12 | 3.0 | 1 to 6 | 4.0 | 2 to 8 | 249.54 | < .001 | A, B, C # D, E |
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| M | SD | M | SD | M | SD | M | SD | M | SD | F | P | ||
| Sexual behavior with casual male partners, < 3 months | |||||||||||||
| Proportion that were HIV-positive and Undetectable | 0.28 | 0.28 | 0.20 | 0.27 | 0.12 | 0.18 | 0.07 | 0.19 | 0.08 | 0.18 | 109.6 | < .001 | A ≠ B ≠ C ≠ D; E ≠ A |
| Proportion that were HIV-positive and viral load was unknown or detectable | 0.06 | 0.13 | 0.16 | 0.20 | 0.02 | 0.07 | 0.01 | 0.07 | 0.02 | 0.07 | 64.8 | < .001 | A ≠ B, C, D, E; B ≠ C |
| Proportion that were on PrEP | 0.24 | 0.26 | 0.14 | 0.21 | 0.41 | 0.29 | 0.22 | 0.30 | 0.14 | 0.21 | 55.9 | < .001 | A ≠ C, E; B ≠ C; C ≠ D, |
| Proportion that were HIV-negative, but not on PrEP (or PrEP not discussed) | 0.15 | 0.23 | 0.21 | 0.35 | 0.28 | 0.28 | 0.44 | 0.38 | 0.28 | 0.32 | 86.3 | < .001 | A ≠ C, E, E; B ≠ D; C ≠ I |
| Proportion whose HIV status was unknown/not discussed | 0.27 | 0.33 | 0.28 | 0.29 | 0.17 | 0.25 | 0.26 | 0.36 | 0.48 | 0.39 | 34.8 | < .001 | A ≠ C, E; B ≠ E; C ≠ D, ] |
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| n | % | n | % | n | % | n | % | n | % | Chi-Sq | P | ||
| Sexual behavior2 with casual male partners, < 3 months | |||||||||||||
| Condomless anal sex (CAS) with HIV-positive and Undetectable, valid n = 1375 | 127 | 35.4 | 10 | 45.5 | 52 | 19.4 | 47 | 7.1 | 13 | 21.7 | 128.9 | < .001 | A, B ≠ C, D, E; C ≠ D; D ≠ |
| CAS with HIV-positive and viral load was unknown or detectable, valid n = 725 | 41 | 30.8 | 7 | 35.0 | 12 | 9.4 | 12 | 2.9 | 9 | 33.3 | 105.98 | < .001 | A, B ≠ C, D; C ≠ D, E; D ≠ |
| CAS with partners on PrEP, valid n = 2126 | 106 | 31.2 | 6 | 31.6 | 138 | 29.4 | 131 | 11.0 | 27 | 26.0 | 119.65 | < .001 | A, B, C, E ≠ D |
| CAS with HIV-negative, but not on PrEP (or PrEP not discussed), valid n = 2221 | 45 | 21.6 | 5 | 38.5 | 85 | 23.5 | 195 | 12.9 | 29 | 22.3 | 39.2 | < .001 | A, B, C, E ≠ D |
| CAS with partners whose HIV status was unknown/not discussed, valid n = 1901 | 70 | 24.0 | 8 | 36.4 | 37 | 12.2 | 90 | 8.2 | 30 | 16.6 | 68.98 | < .001 | A ≠ C, D; B ≠ C, D, E; C ≠ |
| Main partner’s HIV status, valid n = 2027 3 | |||||||||||||
| HIV-positive, undetectable | 96 | 35.4 | 5 | 20.0 | 51 | 22.4 | 57 | 4.1 | 4 | 4.1 | 866.07 | < .001 | A ≠ B ≠ C ≠ D ≠ E |
| HIV-positive, viral load detectable/unknown | 11 | 4.1 | 8 | 32.0 | 3 | 1.3 | 14 | 1.0 | 1 | 1.0 | |||
| HIV status uncertain or unknown | 35 | 12.9 | 2 | 8.0 | 18 | 7.9 | 197 | 14.0 | 39 | 40.2 | |||
| HIV-negative, on PrEP | 35 | 12.9 | 2 | 8.0 | 75 | 32.9 | 23 | 1.6 | 1 | 1.0 | |||
| HIV-negative, not on PrEP or PrEP unknown | 94 | 34.7 | 8 | 32.0 | 81 | 35.5 | 1115 | 79.3 | 52 | 53.6 | |||
1
n= 3641 (72.5%) participants reported at least one casual male sex partner in the 3 months prior.
2
Nested among men who reported that type of partner (e.g., CAS with partners on PrEP (yes/no), nested among the 2126 participants who reported having a partner on PrEP)
3
Nested among those with a main male partner
Values in bold indicate biomed matching. Values in italics indicate biomed sorting.