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Table 7 Factors significantly associated with an HCV positive (HCV+) test in univariate tests and binary logistic regression (forward stepwise selection)

From: Associating conditional cash transfer to universal access to treatment could be the solution to the HCV epidemic among drug users (DUs)

HCV+ % HCV+ % total Sig Odds ratio 95% CI odds ratio
Lower Upper
Injection    < 0.0001 22.250 5.294 93.518
 Yes 33.3 66.3     
 No 3.3 33.7     
NSS    < 0.0001 15.579 7.205 33.688
 Yes 48.1 40.3     
 No 5.6 59.7     
Craving    < 0.0001 9.26 4.83 4.83–17.74
 Yes 49.4 33.2     
 No 9.5 66.6     
Police    < 0.0001 3.519 1.858 6.663
 Yes 36.5 44.6     
 No 14.1 55.2     
SDU or GP    < 0.0001 0.191 0.100 0.366
 Yes 29.9 69.8     
 No 6.2 30.2     
OST    < 0.0001 4.959 2.444 10.060
 Yes 29.8 67.8     
 No 8.1 32.2     
SDU    < 0.0001 3.420 1.814 6.450
 Yes 42.1 21.3     
 No 17.5 78.7     
Prison    0.009 2.279 1.212 4.274
 Yes 29.9 57.4     
 No 15.7 42.6     
Logistic regression B Wald Sig Odds ratio 95% CI odds ratio
Lower Upper
 NSS 0.108 17.440 < 0.0001 1.115 1.080 1.174
 Drug use − 2.623 33.403 < 0.0001 0.73 0.30 0.177
 Police − 1.190 8.310 0.004 0.323 0.150 0.697
 Constant − 1.939 8.310 0.002    
  1. Hosmer and Lemeshow test, 0.991; CC—HCV+, 51.8%; HCV−,90.3%; all, 81%
  2. Injection history of injection, NSS needle and syringe sharing, Craving NSS at a time of craving, Police police crackdown on injections, SDU service for drug users, GP medical practice of a general practitioner, OST opiate substitution therapy, Drug treatment center attending SDU or GP, Drug use duration of drug use, CC correctly classified
  3. Logistic regression odds ratios: NSS absent/present, police: absent/present, injection: NSS− and no injection/NSS+, craving: injection at a time of craving−/injection at a time of craving+ (267 cases: exclusion of HCV+ DUs)