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Table 4 Concurrent predictive validity of the CPQ-A-S and the CAST using cut-off points to maximize detection of cannabis dependence

From: Screening of cannabis-related problems among youth: the CPQ-A-S and CAST questionnaires

Continuous variables CPQ-A-S CAST
  Cut-off point Mean t Sig (2-tailed) Cohen's d Cut-off point Mean t Sig (2-tailed) Cohen's d
Cannabis use patterns
Age at first cannabis use - 3 15.6 4.206 ≤ .001 .71 - 5 15.6 4.166 ≤ .001 .73
  ≥ 3 14.6     ≥ 5 14.6    
Years since first cannabis use - 3 1.78 -3.020 .003 .51 - 5 1.80 -3.247 .001 .57
  ≥ 3 2.58     ≥ 5 2.68    
Global degree of concern about effects of cannabis - 3 2.36 -4.937 ≤ .001 .83 - 5 2.76 -3.398 .001 .56
  ≥ 3 4.77     ≥ 5 4.45    
Number of areas object of concern - 3 1.96 -3.591 ≤ .001 .61 - 5 2.16 -3.062 .003 .53
  ≥ 3 3.90     ≥ 5 3.88    
Psychopathological symptoms
BSI - Somatization symptoms - 3 .219 -4.161 ≤ .001 .77 - 5 .295 -1.902 .059  
  ≥ 3 .516     ≥ 5 .431    
BSI - Obsessive compulsive symptoms - 3 .271 -3.525 .001 .64 - 5 .336 -2.167 .032 .38
  ≥ 3 .597     ≥ 5 .534    
BSI - Interpersonal sensitivity symptoms - 3 .276 -3.628 ≤ .001 .67 - 5 .373 -1.851 .066  
  ≥ 3 .684     ≥ 5 .578    
BSI - Depressive symptoms - 3 .437 -4.458 ≤ .001 .81 - 5 .543 -2.297 .023 .40
  ≥ 3 .891     ≥ 5 .779    
BSI - Anxiety symptoms - 3 .287 -3.966 ≤ .001 .72 - 5 .371 -1.841 .068  
  ≥ 3 .622     ≥ 5 .528    
BSI - Hostility symptoms - 3 .324 -4.271 ≤ .001 .80 - 5 .437 -2.170 .032 .38
  ≥ 3 .795     ≥ 5 .672    
BSI - Phobic symptoms - 3 .291 -2.869 .005 .48 - 5 .358 -.905 .367  
  ≥ 3 .515     ≥ 5 .432    
BSI - Paranoid symptoms - 3 .274 -3.476 .001 .63 - 5 .368 -1.353 .178  
  ≥ 3 .612     ≥ 5 .499    
BSI - Psychoticism symptoms - 3 .257 -4.086 ≤ .001 .76 - 5 .371 -1.668 .098  
  ≥ 3 .672     ≥ 5 .538    
BSI - Additional symptoms - 3 .125 -2.827 .006 .53 - 5 .188 -1.083 .281  
  ≥ 3 .346     ≥ 5 .270    
BSI - Global severity index - 3 .280 -4.362 ≤ .001 .81 - 5 .368 -2.051 .042 .36
  ≥ 3 .630     ≥ 5 .532    
BSI - Total positive symptoms - 3 1.23 -5.104 ≤ .001 .91 - 5 13.01 -1.903 .059  
  ≥ 3 20.30     ≥ 5 17.00    
BSI - Positive Symptom Distress Index - 3 1.15 -3.053 .003 .52 - 5 1.19 -2.151 .033 .37
  ≥ 3 1.44     ≥ 5 1.40    
Other substances use
Frequency of alcohol use in past month - 3 3.02 1.266 .208   - 5 2.99 1.030 .305  
  ≥ 3 2.73     ≥ 5 2.75    
Frequency of tobacco use in past month - 3 2.86 -.875 .383   - 5 2.64 -3.574 .001 .59
  ≥ 3 3.10     ≥ 5 3.54    
Problems with alcohol (RAPI) - 3 9.93 -2.140 .034 .36 - 5 9.99 -2.342 .021 .41
  ≥ 3 13.25     ≥ 5 13.72    
Categorical variables    Χ 2 Sig (2-tailed) Cramer's V    Χ 2 Sig (2-tailed) Cramer's V
Cannabis use in past week (yes/no) - 3   15.54* ≤ .001 .343 - 5   14.43 ≤ .001 .331
  ≥ 3      ≥ 5     
Use of other illegal drugs (yes/no) - 3   2.49* .114   - 5   11.21 .001 .296
  ≥ 3      ≥ 5     
  1. * Chi-squared value with continuity correction
  2. The table shows significant differences in severity of cannabis use patterns, psychopathological distress and other drugs use between adolescents scoring above and below thresholds (3 points in CPQ-AS, 5 in CAST).