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Table 2 Factor structure of common mental disorder (CMD), substance use and dependence (SUD) screening tools

From: Disentangling psychopathology, substance use and dependence: a factor analysis

 

Sample A (N = 232)

Sample B (N = 280)

Inter-factors correlation = .45

Inter-factors correlation = .43

Item

Description

Factor 1 (CMD)

Factor 2 (SUD)

Communality

Factor 1 (CMD)

Factor 2 (SUD)

Communality

Alcohol QF

Alcohol quantity x frequency of use (last week)

–

–

.03

–

–

.02

Heroin QF

Heroin quantity x frequency of use (last week)

 

.53

.27

 

.56

.28

Crack QF

Crack quantity x frequency of use (last week)

 

.36

.11

 

.39

.14

Cannabis QF

Cannabis quantity x frequency of use (last week)

–

–

.03

–

–

.02

TOP4a

Self-rated psychological wellbeing

-.50

 

.25

-.54

 

.27

PHQ1

Loss of interest and pleasure

.53

 

.33

.59

 

.37

PHQ2

Depressed mood

.80

 

.63

.82

 

.63

PHQ3

Disrupted sleeping patterns

.54

 

.28

.58

 

.31

PHQ4

Lethargy

.58

 

.34

.57

 

.31

PHQ5

Disruptions in appetite

.52

 

.32

.54

 

.32

PHQ6

Depressive rumination

.57

 

.58

.61

 

.60

PHQ7

Disrupted concentration

.61

 

.33

.67

 

.39

PHQ8

Psychomotor deficits or agitation

.55

 

.37

.59

 

.40

PHQ9

Suicidal ideation

.61

 

.45

.62

 

.48

GAD1

Feelings of anxiety and nervousness

.79

 

.58

.81

 

.62

GAD2

Impaired control over worry

.93

 

.74

.88

 

.70

GAD3

Generalised worry about different things

.83

 

.62

.82

 

.62

GAD4

Trouble relaxing

.84

 

.62

.86

 

.66

GAD5

Restlessness

.68

 

.50

.69

 

.51

GAD6

Irritability

.55

 

.37

.57

 

.40

GAD7

Fear

.73

 

.56

.63

 

.46

SDS1

Impaired control over substance use

 

.90

.76

 

.88

.74

SDS2

Worry about missing a dose of substance use

 

.78

.58

 

.76

.55

SDS3

Worry about substance use

 

.87

.78

 

.87

.79

SDS4

Wish to stop substance use

 

.83

.62

 

.84

.64

SDS5

Difficulty in abstaining from substance use

 

.61

.41

 

.62

.41

  1. Notes: Factor loadings smaller than cut-off of .30 were omitted. Sample A included all cases with complete data on all items. Sample B applied multivariate imputation of missing data items. Variance explained by the factor solution was 47.5 % in sample A and 48.2 % in Sample B