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Table 3 Associations between recently acquired syphilis infection and characteristics of PICASSO study participants, Lima, Peru, 2013–2014

From: The PICASSO Cohort: baseline characteristics of a cohort of men who have sex with men and male-to-female transgender women at high risk for syphilis infection in Lima, Peru

Baseline characteristics Recently acquired syphilis infection prevalence Bivariate analysis Multivariate analysis
n/N (%) Crude PR (95% CI) Adjusted PR (95% CI)
Overall 58/285 (20.4)   
Age, years   0.97 (0.94–0.99) 0.96 (0.93–0.99)
 18–25 22/98 (22.5)   
 26–30 13/56 (23.2)   
 31–35 13/50 (26.0)   
 36+ 10/81 (12.4)   
Number of recent male/transwomen sex partners (quartiles)  
 0–2 21/86 (24.4) Ref  
 3–5 18/84 (21.4) 0.88 (0.50–1.53)  
 6–10 8/50 (16.0) 0.66 (0.31–1.37)  
 11+ 11/65 (16.9) 0.69 (0.36–1.34)  
Role during anal sex  
 Insertive 5/71 (7.0) Ref Ref
 Receptive 22/85 (25.9) 3.68 (1.46–9.22) 2.56 (1.05–6.25)
 Versatile 31/129 (24.0) 3.41 (1.39–8.40) 1.99 (0.82–4.85)
Condomless anal sex with a male partner, last 3 months  
 No 14/70 (20.0) Ref  
 Yes 44/215 (20.5) 1.02 (0.59–1.75)  
Condomless anal sex with stable male partners, last 3 months  
 No 21/97 (21.7) Ref  
 Yes 37/188 (19.7) 0.91 (0.56–1.46)  
Any anal sex partner met over the Internet in last 3 months  
 No 34/182 (18.7) Ref  
 Yes 24/103 (23.3) 1.25 (0.78–1.98)  
Any anal sex with an anonymous sex partner in last 3 months  
 No 30/140 (21.4) Ref  
 Yes 28/145 (19.3) 0.90 (0.57–1.43)  
Any anal sex in a sex club in last 3 months  
 No 46/244 (18.9) Ref  
 Yes 12/41 (29.3) 1.55 (0.90–2.67)  
HIV infection   
 Negative 31/206 (15.1) Ref Ref
 Known infecteda 20/50 (40.0) 2.66 (1.66–4.25) 1.70 (1.11–2.61)
 Newly diagnosed 7/29 (24.1) 1.60 (0.78–3.31) 1.37 (0.72–2.60)
Any anal CT or NG infection   
 Negative 38/229 (16.6) Ref Ref
 Positive 20/56 (35.7) 2.15 (1.36–3.40) 1.69 (1.09–2.60)
Previous syphilis diagnosis (per patient interview)  
 No 24/213 (11.3) Ref Ref
 Yes 34/71 (47.9) 4.25 (2.71–6.66) 3.53 (2.20–5.68)
Alcohol use disorder (AUDIT score ≥ 8)  
 No 32/151 (21.2) Ref  
 Yes 26/134 (19.4) 0.92 (0.58–1.45)  
  1. Transwomen (male-to-female transwomen); Human immunodeficiency virus (HIV); Chlamydia trachomatis (CT); and Neisseria gonorrheae (NG)
  2. aSelf reported on baseline survey
  3. bBolded text indicates a p-value <0.05