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Table 1 Baseline characteristics of men who have sex with men and male-to-female transgender participants of the PICASSO study, 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

Characteristic MSM Transwomen
n (N = 312) (%) n (N = 89) (%)
Survey
 Age median years (Interquartile range [IQR]) 29.0 (23.3, 37.4) 32.5 (27.2, 39.5)
 Income less than living wagea 87 (27.9) 62 (76.5)
 Education
  Primary school or less 7 (2.2) 8 (9.0)
  Secondary school or less 111 (35.6) 65 (73.0)
  Vocational school graduate 69 (22.1) 11 (12.4)
  University student 90 (28.9) 3 (3.4)
  University graduate or higher 40 (11.2) 2 (2.3)
 Work
  Full time 157 (50.3) 33 (37.1)
  Part time 41 (13.1) 23 (25.8)
  Odd jobs 46 (14.7) 26 (29.2)
  Unemployed or does not work 68 (21.8) 7 (7.9)
 Use of antibiotics in the last 3 months 123 (39.4) 37 (41.6)
 Use of un-prescribed injections in the last 3 months 93 (29.8) 27 (30.3)
 Comorbidities (by self-report in the survey):
  Prior diagnosis of syphilis 111 (35.6) 35 (39.3)
  Prior diagnosis of HIV 62 (24.1) 21 (27.6)
   Not taking ART 34/62 (54.8) 11/21 (52.4)
    Recent syphilis by laboratory testing 8/34 (23.5) 1/11 (9.1)
    Diagnosis of STI in the last 6 months 22/34 (64.7) 5/11 (45.5)
 Primary role during anal sex
  Insertive 87 (27.9) 2 (2.3)
  Receptive 68 (21.8) 60 (67.4)
  Versatile (e.g. both) 157 (50.3) 27 (30.3)
 Stableb partner, last 3 months 141 (45.2) 47 (52.8)
 Sex with a male partner, last 3 months 312 (100) 81 (100)
 Median number of male partner(s), last 3 months (IQR) 4 (2, 7) 15 (5, 40)
 Sex with a female partner, last 3 months 45 (14.4) 1 (1.1)
 Alcohol use disorder (AUDIT score > 8) 139 (44.6) 42 (47.2)
Laboratory
  Syphilis infection
   Recent syphilis (RPR ≥ 1:16) 52 (16.8) 6 (6.7)
   Prior syphilis infectionc (RPR between 1:1–1:8) 79 (25.3) 45 (50.6)
   No syphilis infectiond 157 (50.8) 38 (42.7)
  HIV infection 94 (30.1) 30 (33.7)
  Total Chlamydia trachomatis (CT) 57 (18.6) 22 (24.7)
   Anal CT 43 (14.1) 12 (13.5)
   Pharyngeal CT 14 (4.5) 10 (11.2)
  Total Neisseria gonorrheae (NG) 44 (14.2) 17 (19.1)
   Anal NG 26 (8.4) 10 (11.2)
   Pharyngeal NG 18 (5.8) 7 (7.9)
  Co-infections with recent syphilis (n = 58, MSM [N = 52]; Transwomen [N = 6])
   HIV 23 (44.2) 4 (66.7)
   Total CT 21 (40.4) 0 (0)
   Anal CT 17 (32.7) 0 (0)
   Pharyngeal CT 4 (7.7) 0 (0)
   Total NG 10 (19.2) 1 (16.7)
   Anal NG 6 (11.5) 1 (16.7)
   Pharyngeal NG 4 (7.7) 0 (0)
  1. Human immunodeficiency virus (HIV); antiretroviral therapy (ART); Rapid plasma reagin (RPR); Treponema Pallidum Particle Agglutination (TPPA); Chlamydia trachomatis (CT); Neisseria gonorrheae (NG); and sexually transmitted infection (STI)
  2. aLiving wage was approximately $250 USD per month in 2013–2014
  3. bThe participant self-identified that they had a stable sexual partner
  4. cTPPA positive individuals that did not meet criteria for recently acquired syphilis infection
  5. dRPR-negative and TPPA-negative individuals