Baseline 4 Months 8 months p-valueb
             
Urine Testing Profile N % N % N %
Marijuana              
Group A (n=124) 75 60.48 60 48.39 62 50.00 .048
Group B (n=141) 60 46.15 52 40.00 51 39.23 .358
Cocaine              
Group A (n=124) 40 32.26 7 5.65 14 11.29 .001
Group B (n=130) 44 33.85 10 7.69 9 6.92 .001
Methamphetamine              
Group A (n=124) 90 72.58 21 16.94 29 23.39 .001
Group B (n=130) 92 70.77 36 27.69 37 28.46 .001
Amphetamine              
Group A (n=124) 61 49.19 20 16.13 25 20.16 .001
Group B (n=130) 63 48.46 28 21.54 32 24.62 .001
Opiates              
Group A (n=124) 6 4.84 7 5.65 9 7.26 .660
Group B (n=141) 10 7.69 12 9.23 6 4.62 .018
Sexual Activity Profile                    
Multiple Partners              
Group A (n=148) 55 37.16 30 20.27 22 14.86 .001
Group B (n=163) 57 34.97 28 17.18 30 18.40 .001
HIV/AIDS Knowledge Profilec Mean   Mean   Mean    
Total Knowledge (mean)              
Group A (n =152 ) 7.32   16.97   16.70   .001
Group B (n =162) 7.30   17.25   16.98   .001
Cognitive Knowledge              
   Group A (n=150) 5.27   7.69   7.50   .001
   Group B (n=162) 5.25   7.78   7.73   .001
Transmission Knowledge              
   Group A (n=152) 1.85   9.28   9.20   .001
   Group B (n=162) 1.86   9.46   9.25   .001
HBV Knowledge Profile (mean)              
    Group A (n=152) 5.58   10.40   10.19   <.001
    Group B (n=161) 5.57   10.23   9.30   <.001
Cognitive Knowledge Profile (mean)              
    Group A (n=140) 3.85   4.79   4.51   .004
 Group B (n=137) 4.11   4.59   4.47   .472
Transmission (mean)              
    Group A (n=137) 1.74   6.09   5.77   <.001
    Group B (n=145) 1.74   5.74   5.14   <.001
               
aFor participants with non-missing outcome values at each time period.
bFor change over time based on log-linear modeling chi-square test and on multi-level linear regression (for knowledge).
cA person who answered at least 19 items correctly (the upper quartile score) was considered to have a high score of HIV/AIDS knowledge. 
Table 2: Percent Drug Metabolite Positive Urine Samples by Condition Over Time a.
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