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Table 1 Cronbach’s alpha values, mean 4DSQ-scores and standard deviations of the study groups

From: Cross-cultural validation of the Turkish Four-Dimensional Symptom Questionnaire (4DSQ) using differential item and test functioning (DIF and DTF) analysis

  

Cronbach’s alpha

Mean scores (SD)

4DSQ-scales

scale range

Turkish

Dutch

p

Turkish

Dutch

p

Distress

0–32

0.90

0.93

0.002

12.6 (8.1)

19.9 (9.0)

0.000

Depression

0–12

0.86

0.92

0.001

3.0 (3.4)

4.4 (4.2)

0.000

Anxiety

0–24

0.84

0.92

0.000

5.2 (5.1)

7.2 (6.9)

0.000

Somatization

0–32

0.86

0.89

0.035

11.1 (7.0)

15.3 (8.2)

0.000