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Table 1 Demographic characteristics and laboratory test results of 689 male inmates at the enrolment, Bangkok Thailand, 2001–2002.

From: HIV infection and risk factors among Bangkok prisoners, Thailand: a prospective cohort study

Characteristics Number (%)*
Age (years)  
   Mean ± SD 32.3 ± 6.7
   Median (Range) 32(20–50)
Marital status  
   Single 293 (42.6)
   Married 237 (34.5)
   Divorced, separated and widowed 157 (22.9)
Home town  
   Bangkok and its suburbs 334 (48.5)
   Other locations in Thailand 310 (45.0)
   Outside Thailand (foreigners) 45 (6.5)
Highest education level  
   Primary 354 (52.3)
   Secondary or Higher 323 (47.7)
Occupation before incarceration  
   No occupation 44 (6.4)
   Labor 463 (67.2)
   Private business 116 (16.8)
   Others 66 (9.6)
Monthly income (Baht) excluding the unemployed**  
   Mean ± SD 12,788 ± 25,157
   Median(Range) 6,000 (330–250,000)
Type of offense  
   Narcotic-related 298 (45.9)
   Life- or sex-offended 179 (27.6)
   Theft or robbery 172 (26.5)
Term of sentence (years)  
   Mean ± SD 18.9 ± 8.4
   Median (Range) 18(5.7–30.0)
Duration of sentence already served (years)  
   Mean ± SD 5.8 ± 3.9
   Median(Range) 5.0(1.0–18.0)
Laboratory profiles (% positivity)  
   Anti HIV antibody 175 (25.4)
   Anti HCV antibody 309 (44.9)
   HBs Antigen 77 (11.2)
   Anti HBc antibody 442 (64.2)
   Anti HBs antibody 286 (41.5)
   Anti Chlamydia IgM antibody 140 (20.3)
   VDRL with TPHA confirmation 22 (3.2)
   Anti HSV2 IgM antibody 72 (10.4)
   Urine opiates 78 (11.3)
   Urine metamphetamines 42 (6.1)
  1. Note: *The total numbers may not add up to 689 because of no responses from some participants. **1 US dollar = 43 Baht (approximately)