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Table 1 Characteristics of HIV-positive MSM included in the analysis, OHTN Cohort Study, 2006–2010

From: High incidence of diagnosis with syphilis co-infection among men who have sex with men in an HIV cohort in Ontario, Canada

  Analysis of first syphilis diagnosis Analysis of syphilis re-diagnosis Combined analysis of new syphilis diagnosis
  n % n % n %
Total N 1799 100 586 100 2271 100
Mean age at baseline (SD) (a) 45.2 9.2 47.1 10.5 45.9 9.5
Sexual orientation
 Gay 1360 75.6 493 84.1 1752 77.1
 Bisexual 129 7.2 27 4.6 151 6.6
 Heterosexual 75 4.2 7 1.2 81 3.6
 Unknown (b) 235 13.1 59 10.1 287 12.6
Race
 White 1311 72.9 423 72.2 1654 72.8
 Black/African 54 3 27 4.6 77 3.4
 Multiple 138 7.7 52 8.9 177 7.8
 Indigenous 111 6.2 20 3.4 126 5.5
 Other 116 6.4 51 8.7 157 6.9
 Unknown 69 3.8 13 2.2 80 3.5
Education (c)
 High school or less 395 22 111 18.9 493 21.7
 Trade school or college 498 27.7 179 30.5 633 27.9
 University 680 37.8 242 41.3 871 38.4
 Unknown (b) 226 12.6 54 9.2 274 12.1
Annual personal income (c)
 Less than $20,000 CDN 565 31.4 188 32.1 716 31.5
 $20,000 to $59,999 CDN 631 35.1 213 36.3 799 35.2
 $60,000 CDN or more 353 19.6 122 20.8 452 19.9
 Unknown (b) 250 13.9 63 10.8 304 13.4
Region where receiving HIV care
 Toronto 1224 68 474 80.9 1598 70.4
 Ottawa 193 10.7 50 8.5 237 10.4
 Elsewhere in Ontario 382 21.2 62 10.6 436 19.2
Year of HIV diagnosis
 Median (IQR) 1997 (91,03) 1997 (91,03) 1996 (91,03)
 Diagnosed in 2006–09 177 9.8 56 9.6 214 9.4
Clinical status at baseline (a)
 Initiated antiretroviral treatment 1952 86.0 1546 85.9 491 83.8
 Mean CD4 cell count/mm3 (SD) 497.1 261.6 491.3 252.4 497.1 261.6
 Undetectable viral load (d) 1173 65.2 363 61.9 1473 64.9
  1. MSM Men who have sex with men, SD Standard deviation, IQR Interquartile range
  2. (a) Baseline was the later of January 1, 2006 or the date of enrolment in the cohort
  3. (b) Unknowns include men who were not interviewed
  4. (c) As reported at the participant’s first interview in 2007–2010, available for 1967/2271 men
  5. (d) Undetectable viral load defined as <50 copies/mL in 2006–2009 and <40 copies/mL in 2010