Multivariable logistic regression (GEE)a
  aOR (95% CI) P-value
Presentation year    
Before 2010 1.0  
During 2010 1.1 (0.7, 1.8) 0.736
Seen in a clinic in London    
No 1.0  
Yes 1.1 (0.7, 1.7) 0.648
Duration of symptoms    
Week or less 1.0  
More than a week 0.5 (0.3, 0.8) 0.002
Unknown 0.7 (0.4, 1.4) 0.369
Referral    
No 1.0  
Yes 0.4 (0.2, 1.1) 0.073
Unknown 0.4 (0.2, 1.2) 0.107
Location of symptoms reported    
None 1.0  
Only Genital 0.4 (0.1, 1.2) 0.118
Only Rectal 1.4 (0.6, 3.4) 0.441
Both 0.8 (0.3, 2.0) 0.567
Unknown 0.9 (0.3, 2.8) 0.879
Site of infection    
Rectal 1.0  
Genital 1.2 (0.2, 5.5) 0.847
Both or other (throat, n=1) 0.5 (0.1, 2.0) 0.303
Unknown 0.6 (0.4, 1.0) 0.053
Any systemic symptom    
No 1.0  
Yes 1.6 (1.0, 2.6) 0.057
Unknown 2.0 (0.8, 5.1) 0.157
Any other STI    
No 1.0  
Yes 1.1 (0.7, 1.7) 0.601
Unknown 0.5 (0.3, 1.0) 0.037
Age 1.0 (1.0, 1.1) 0.099
Sexuality    
Homosexual 1.0  
Bisexual 0.2 (0.1, 0.6) 0.006
Number of contacts 1.0 (1.0, 1.0) 0.370
Receptive anal intercourse    
None reported 1.0  
Reported protected or unknown 1.4 (0.6, 3.3) 0.428
Unprotected 2.7 (1.3, 5.8) 0.010
Unknown 2.5 (0.8, 7.6) 0.109
Insertive anal intercourse    
None reported 1.0  
Reported protected or unknown 0.8 (0.4, 1.6) 0.473
Unprotected 1.2 (0.6, 2.2) 0.668
Unknown 1.3 (0.5, 2.7) 0.641
Any oral sex    
None reported 1.0  
Reported some 1.9 (0.5, 7.0) 0.336
Reported one unprotected 1.2 (0.4, 4.0) 0.730
Reported both unprotected 1.9 (0.9, 4.2) 0.108
Some or all unknown 1.0 (0.4, 2.5) 0.992
Any fisting    
No fisting reported 1.0  
Some fisting reported 1.9 (0.6, 6.3) 0.297
Both reported, unprotected 3.5 (0.8, 15.5) 0.093
Some unknown 0.9 (0.6, 1.4) 0.777
a Multivariable model adjusted also for form delay (days between presentation to the clinic and filling in the surveillance form).
Table 3: Final multivariable model.
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