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Table 1 Characteristics of the study participants (n = 533)

From: Prevalence of HIV and syphilis co-infection and associated factors among non-commercial men who have sex with men attending a sexually transmitted disease clinic in Shenzhen, China

Variable Category Number Percent (%)
Age (year)
  <25 93 17.4
≥25 440 82.6
Ethnicity
  Han 499 93.6
Other minorities 34 6.4
Marital status
  Married 129 24.2
Unmarried 404 75.8
Educational level
  ≤Junior middle school 160 30.0
>Junior middle school 373 70.0
Socioeconomic Disconnection
  Yes 52 9.8
No 481 90.2
Monthly income (RMB)
  ≤3000 211 39.6
3001-5000 183 34.3
>5000 139 26.1
Length of stay in Shenzhen (year)
  >2 183 34.3
1-2 73 13.7
<1 277 52.0
Having vaginal sexual intercourse
  Yes 354 66.4
No 179 33.6
Age at first anal sexual intercourse (year)
  ≥18 439 82.4
<18 94 17.6
Having a fixed homosexual partner
  Yes 368 69.0
No 165 31.0
Number of anal sexual partners in the past 6 months
  ≤2 217 40.7
3-5 150 28.1
>5 166 31.2
Roles in anal sexual intercoursea
  Insertive 212 41.1
Receptive 123 23.8
Both 181 35.1
Always using condom in anal sexual intercourse in the past 6 monthsa
  Yes 214 42.5
No 289 57.5
HIV-related knowledge
  <6 378 70.9
≥6 155 29.1
  1. aData may not add up to 533 because of missing data