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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).
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Substance Abuse Treatment, Prevention, and Policy

ISSN: 1747-597X