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Table 16 Coverage of the symptom questionnaires measuring distress, depression, anxiety and somatization by the 4DSQ scales; standardised Beta-coefficients and explained (shared) variance R2 (results from linear regression analysis)

From: The Four-Dimensional Symptom Questionnaire (4DSQ): a validation study of a multidimensional self-report questionnaire to assess distress, depression, anxiety and somatization

  Cronbach's α Standardised Beta-coefficients R2 Coveragea
   Distress Depression Anxiety Somatization   
Distress        
- GHQ 0.87 0.53* 0.06 0.03 -0.05 0.34 0.39
- MQ 0.88 0.61*** 0.13 0.08 0.08 0.60 0.68
Depression        
- HADS-Dep 0.76 0.71*** 0.02 -0.16 0.10 0.42 0.55
- SDS 0.75 0.42* 0.22 0.08 0.24* 0.54 0.72
- SCL-90-Dep 0.91 0.48*** 0.32*** 0.17*** -0.04 0.66 0.73
- BDI 0.86 0.25** 0.43*** 0.20* 0.02 0.61 0.71
Anxiety        
- STAI-State 0.93 0.39*** 0.15* 0.16** 0.05 0.43 0.46
- HADS-Anx 0.66 0.30* -0.01 0.55*** 0.10 0.60 0.91
- SCL-90-Anx 0.85 0.15** 0.04 0.64*** 0.15*** 0.71 0.84
- SCL-90-Ago 0.87 -0.01 -0.10 0.82*** 0.05 0.64 0.74
- BAI 0.92 0.14* 0.04 0.46*** 0.35*** 0.74 0.80
Somatization        
- SCL-90-Som 0.82 0.14** -0.07 0.14** 0.71*** 0.72 0.88
  1. * p < 0.05, ** p < 0.01, *** p < 0.001 (1-tailed)
  2. a Coverage = R2 /Cronbach's α