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Table 3 Tests for multigroup invariance across the IBS-subtype groups

From: Irritable bowel syndrome-specific health-related quality of life instrument: development and psychometric evaluation

  χ 2 (df) χ 2/df RMSEA (90 % CI) Comparison χ 2 (∆df) p
Model 1a 704.92 (388) 1.81 0.06 (0.05–0.06) - - -
Model 2b 743.48 (424) 1.75 0.05 (0.05–0.06) Model 1 vs. Model 2 38.57 (36) 0.354
Model 3c 775.72 (454) 1.71 0.05 (0.04–0.06) Model 2 vs. Model 3 32.24 (30) 0.357
Model 4d 834.67 (505) 1.65 0.05 (0.04–0.06) Model 3 vs. Model 4 58.95 (51) 0.207
  1. aConfigural Model: No equality constraints imposed
  2. bAll factor loadings constrained equal
  3. cAll factor loadings and covariances among 4 factors constrained equal
  4. dAll factor loadings, covariances among 4 factors, and error variance constrained equal
  5. χ 2= difference in χ 2 values between models
  6. df = difference in number of degrees of freedom between models