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. Author manuscript; available in PMC: 2016 Oct 7.
Published in final edited form as: Subst Use Misuse. 2015 Oct 7;50(10):1351–1359. doi: 10.3109/10826084.2015.1013132

Table 2.

Comparison of drug use indicators, demographics, sex behaviors, and drug use behaviors among PWID in Tijuana (n = 1,025)

Total (%) Class 1: No Polydrug Use (Predominately Heroin) n=515 (%) Class 2: Meth-amphetamine + Heroin n=448 (%) Class 3:Meth-amphetamine + Cocaine + Heroin n= 62 (%)
Drug Use Indicators

Cocaine injection 96 (9.1) 21 (4.1) 42 (9.4) 28 (45.2)
Cocaine non-injection 78 (7.4) 17 (3.3) 0 (0.0) 60 (96.8)
Methamphetamine injection 356 (33.7) 0 (0.0) 313 (69.9) 30 (48.4)
Methamphetamine non-injection 410 (38.8) 48 (9.3) 303 (67.6) 48 (77.4)

Demographics

Age, Mean (SD)* 36.6 (8.39) 38.1 (8.40) 34.9 (8.04) 37.8 (8.28)
Male* 876 (85.5) 460 (89.3) 367 (81.9) 49 (79.0)
Female* 149 (14.5) 55 (10.7) 81 (18.1) 13 (21.0)
Income over 3500 pesos* 442 (43.1) 244( 48.4) 172 (39.4) 26 (43.3)
Secondary school* 426 (41.5) 222 (43.1) 171 (38.2) 33 (53.2)
Homeless 126 (12.3) 63 (12.2) 54 (12.1) 9 (14.5)
Born in Tijuana 232 (22.6) 118 (22.9) 99 (22.1) 15 (24.2)
Deported to Tijuana 402 (39.2) 210 (40.8) 171 (38.2) 21 (33.9)

Sex behaviors

Sex exchange* 107 (10.8) 48 (9.3) 43 (9.6) 16 (25.8)
2+ Casual Sex Partners* 141 (13.7) 53 (10.3) 64 (14.3) 24 (38.7)
Drug use before sex* 164 (15.9) 60 (11.7) 82 (18.4) 22 (35.5)

Disease prevalence

HIV 41 (4.0) 18 (3.5) 22 (4.9) 1 (1.6)
Syphilis 79 (7.7) 35 (6.8) 39 (8.8) 5 (8.1)

Drug use behaviors

Daily+ Heroin Injecting* 937 (91.3) 478 (92.8) 407 (90.9) 52 (83.9)
Years Injecting, Mean (SD)* 15 (9.09) 16.2 (9.39) 13.7 (8.44) 15.9 (9.65)
Past 6 Month Overdose* 75 (7.4) 24 (4.7) 41 (9.2) 10 (16.1)
Receptive Syringe Sharing* 602 (58.8) 246 (47.8) 313 (69.9) 43 (69.4)
Distributive Syringe Sharing* 630 (61.4) 264 (51.3) 320 (71.4) 46 (74.2)

Simultaneous injecting use

Speedball (Heroin/Cocaine)* 120 (11.7) 30 (5.8) 64 (14.3) 26 (41.9)
Methamphetamine/Cocaine* 27 (2.6) 2 (.4) 16 (3.6) 9 (14.5)
Methamphetamine/Heroin* 546 (53.3) 181 (35.1) 327 (73.0) 38 (61.3)
*

p<.05,

PWID: People Who Inject Drugs

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