Dropout - not completing detoxification
Wald (df) p Cox & Snell
Predictors     R2
Step 1: demographics     0.060
Age 10.55(1) < .01  
Sex 0.79 (1) ns  
  Step:χ2 = 11.41, df = 1;p < .01
Step 2: drug use characteristics 0.104
Primary substance of abuse 8.58 (1) <.01  
Age of first use 0.50 (1) ns  
Duration of drug problems 0.01 (1) ns  
More than one substance of abuse 0.86 (1) ns  
Route of drug administration 2.08 (1) ns  
Frequency of use 0.45 (1) ns  
  Step:χ2=8.88,df = 1;p < .01  
Step 3: psychological characteristics 0.136
Cluster B PD 6.63 (1) 0.01  
Non-Cluster B PD 0.62 (1) ns  
Axis I disorders 0.29 (1) ns  
Chronic pain condition 1.93 (1) ns  
  Step:χ2=6.58,df = 1;p =.01
  Model:χ2 = 26.86,df = 3; p <.01
Table 3: Logistic regression predicting detoxification failure (dropout).
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