HIV-positive HIV-unknown Univariale logistic regression (GEE) Multivariable logistic regression (GEE)a
  (n=1087) (n=255) OR (95% CI) P-value OR (95% CI) P-value
Presentation year            
Before 2010 731 (67.7%) 196 (77.2%) 1.0   1.0  
During 2010 349 (32.3%) 58 (22.8%) 1.6 (1.2, 2.2) 0.003 1.5 (1.0, 2.3) 0.034
Age            
mean (sd) 38.6 (8.1) 37.0 (9.9) 1.0 (1.0, 1.0) 0.023 1.0 (1.0, 1.0) 0.072
Ethnicity            
White 953 (87.7%) 229 (89.8%) 1.0   Not included  
Black 51 (4.7%) 9 (3.5%) 1.3 (0.7, 2.8) 0.426    
Asian 30 (2.8%) 7 (2.8%) 1.0 (0.4, 2.3) 0.969    
Other 36 (3.3%) 7 (2.8%) 1.2 (0.5, 2.7) 0.650    
Unknown 17 (1.6%) 3 (1.2%) 1.3 (0.4, 4.4) 0.625    
Sexuality            
Homosexual 1,076 (99.0%) 243 (95.3%) 1.0   1.0  
Bisexual 11 (1.0%) 12 (4.7%) 0.2 (0.1, 0.5) <0.001 0.2 (0.1, 0.7) 0.008
Acquisition country            
UK 828 (76.2%) 198 (77.7%) 1.0   1.0  
Abroad 81 (7.5%) 16 (6.3%) 1.2 (0.7, 2.1) 0.476 1.1 (0.5, 2.3) 0.812
Either 47 (4.3%) 13 (5.1%) 0.9 (0.5, 1.6) 0.651 0.7 (0.3, 1.7) 0.497
Unknown 131 (12.1%) 28 (11.0%) 1.1 (0.7, 1.7) 0.604 0.8 (0.4, 1.7) 0.634
Met sex partners in sex-on-premises venuesb            
None reported 277 (25.5%) 63 (24.7%) 1.0   1.0  
Met partners in the locations 263 (24.2%) 50 (19.6%) 1.2 (0.8, 1.8) 0.371 0.8 (0.4, 1.3) 0.302
Unknown 547 (50.3%) 142 (55.7%) 0.9 (0.6, 1.2) 0.449 0.7 (0.5, 1.1) 0.182
Number of contacts            
median (range) 3 (0-201) 3 (0-213) 1.0 (1.0, 1.0) 0.354 1.0 (1.0, 1.0) 0.134
Receptive anal intercourse            
None reported 51 (4.7%) 24 (9.4%) 1.0   1.0  
Protected/or unknownc 161 (14.8%) 79 (31.0%) 0.9 (0.5, 1.6) 0.840 1.4 (0.6, 3.0) 0.440
Unprotected 791 (72.8%) 127 (49.8%) 2.9 (1.7, 4.8) <0.001 3.1 (1.5, 6.1) 0.002
Unknown 84 (7.7%) 25 (9.8%) 1.6 (0.8, 3.0) 0.180 2.8 (1.0, 8.3) 0.057
Insertive anal intercourse            
None reported 100 (9.2%) 25 (9.8%) 1.0   1.0  
Protected/or unknownc 154 (14.2%) 65 (25.5%) 0.6 (0.4, 1.0) 0.056 0.8 (0.4, 1.6) 0.556
Unprotected 615 (56.6%) 106 (41.6%) 1.5 (0.9, 2.3) 0.117 1.1 (0.6, 2.1) 0.803
Unknown 218 (20.1%) 59 23.1 0.9 (0.6, 1.6) 0.811 1.1 (0.5, 2.6) 0.736
Any oral sex            
None reported 72 (6.6%) 28 (11.0%) 1.0   1.0  
Reported some 23 (2.1%) 6 (2.4%) 1.5 (0.6, 3.9) 0.439 1.8 (0.5, 6.3) 0.382
Reported one unprotected 30 (2.8%) 10 (3.9%) 1.2 (0.5, 2.7) 0.728 1.1 (0.3, 3.0) 0.976
Reported both unprotected 812 (74.7%) 165 (64.7%) 1.9 (1.2, 3.0) 0.008 1.6 (0.7, 3.5) 0.289
Some or all unknown 150 (13.8%) 46 (18.0%) 1.3 (0.7, 2.2) 0.414 0.8 (0.3, 2.1) 0.689
Any fisting            
No fisting reported 419 (38.6%) 114 (44.7%) 1.0   1.0  
Some fisting reported 52 (4.8%) 9 (3.5%) 1.6 (0.8, 3.2) 0.224 2.1 (0.7, 6.3) 0.170
Both reported, unprotected 71 (6.5%) 6 (2.4%) 3.1 (1.4,6.9) 0.007 3.7 (1.0, 14.1) 0.056
Some unknown 545 (50.1%) 126 (49.4%) 1.2 (0.9, 1.6) 0.245 1.1 (0.7, 1.7) 0.655
Sharing sex toys            
None reported 412 (37.9%) 108 (42.4%) 1.0   Not includedd  
Any reported 77 (7.1%) 17 (6.7% 1.2 (0.7, 2.0) 0.581    
Unknown 598 (55.0%) 130 (51.0%) 1.2 (0.9, 1.6) 0.193    
Vaginal intercourse            
None reported 798 (73.4%) 201 (78.8%) 1.0   Not included  
Any reported 4 (0.4%) 2 (0.8%) 0.5 (0.1, 2.6) 0.415    
Unknown 285 (26.2%) 52 (20.4%) 1.4 (1.0, 1.9) 0.051    
a Multivariable model adjusted also for form delay (days between presentation to the clinic and filling in the surveillance form).
b No new sex partners in these locations versus backroom, sauna, cruising ground and sex party.
c Reported the type of sex without information on protection, or reported the type of sex was protected.
d Sharing sex toys not included in the multivariate model as it was strongly correlated (covariance >0.8) with fisting variable.
Table 2: Behavioural variables and their association with HIV status in the LGV Enhanced Surveillance data.
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