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Table 2 Results of the multi-group confirmative factor analyses (CFA)

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

4DSQ-scales

Chi-square

df

p

CFI

TLI

RMSEA

90 % CI

Distressa

442.41

204

0.000

0.994

0.993

0.058

0.050–0.065

Depressionb

30.99

16

0.014

0.999

0.999

0.052

0.023–0.079

Anxiety

236.93

108

0.000

0.993

0.991

0.058

0.048–0.068

Somatizationc

356.90

200

0.000

0.989

0.987

0.047

0.039–0.055

  1. Chi-square = mean and variance adjusted model chi-square statistic
  2. CFI comparative fit index
  3. TLI Tucker-Lewis index
  4. RMSEA root mean square error of approximation
  5. 90 % CI 90 % confidence interval of the RMSEA
  6. a residual correlations allowed between item pairs #20-#39 (sleep problems), and #47-#48 (upsetting events)
  7. b residual correlations allowed between item pairs #33-#46 (suicidal ideation)
  8. c residual correlations allowed between item pair #15-#16 (thoracic symptoms), and item triplet #9-#12-#13 (gastro-intestinal symptoms)