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Table 1 Comparing prevalence of substance use and sexual risk practices between heterosexual IDUs (n = 331) and non-IDUs (n = 65)

From: Comparing sexual risks and patterns of alcohol and drug use between injection drug users (IDUs) and non-IDUs who report sexual partnerships with IDUs in St. Petersburg, Russia

  IDU non-IDU  
  n (%)*1 n (%)*1 p-value
Demographics    
Age (median, IQR) 29 (25-32) 24 (21-32) < 0.001*
Male sex 243 (73) 26 (40) < 0.001
Married/partnered 135 (41) 15 (23) 0.009
Postsecondary education 191 (58) 50 (77) 0.004
Employed 147 (44) 51 (80) < 0.001
Live with family 196 (59) 27 (42) 0.009
Any legal income 250 (76) 58 (89) 0.015
Jail 116 (36) 2 (3) < 0.001
Homeless 61 (18) 9 (14) 0.376
Sexual behavior of subjects in the past 6 months    
Had > 1 sex partner 141 (43) 44 (68) < 0.001
Any casual partner 145 (44) 43 (66) 0.001
Had a new (< 90 days) partner 172 (58) 38 (62) 0.491
Unprotected sex at last intercourse with any partner 183 (59) 44 (71) 0.074
Unprotected sex at last intercourse with casual partners*2 114 (34) 37 (57) 0.001
Had sex when high on drugs or alcohol*3 228 (70) 35 (55) 0.017
Sexually transmitted infections    
Tested positive for HIV antibodies 90 (27) 2 (3) < 0.001
Tested positive for a non-viral STI*4 19 (6) 7 (11) 0.166
Alcohol consumption in the past month    
Risky alcohol use*5 208 (66) 50 (85) 0.004
Days used alcohol last 30 days (median, IQR) 5 (2-15) 5 (2-10) 0.816*
Drinks on average each time drinking (median, IQR) 3 (2-5) 3 (2-5) 0.667*
Days had > 4 drinks in 2 hours or got drunk (median, IQR) 1 (0-4) 1 (0-3) 0.687*
Illicit drug consumption in the past month* 6    
Meth use*7 60 (18) 7 (11) 0.155
Injection practices in the last 6 months    
Unsafe injection, 30 days 82 (25)   
Number of times injected last 30 days, median (p25-75) 20 (8-30)   
  1. * Wilcoxon rank-sum test
  2. *1 among participants who replied the question
  3. *2 i.e. had unprotected sex with non-main or new (< 90 days) sexual partners
  4. *3 had sex while participant or partner or both were drunk or high
  5. *4 Chlamydia trachomatis, Neisseiae gonorrheae and/or syphilis serology
  6. *5 determined by an at-risk AUDIT-C score
  7. *6 IDUs injected mostly heroin and meth. All other drugs such as cocaine, crack, speedball were < 7% prevalence among
  8. IDUs as well as among non-IDUs
  9. *7 i.e. amphetamine, ephedrine or methamphetamine. Among IDUs 99% of meth was consumed in the form of injection