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Table 3 Tests of measurement invariance using multi-group confirmatory factor analysis

From: Validation of the Headache Impact Test (HIT-6) in patients with chronic migraine

  Model fit Model comparison
Parameter constraints TLI CFI RMSEA ∆CFI ∆RMSEA Chi-square for nested model comparison
Measurement Invariance Across Studies
None - Configural Model 0.979 0.978 0.086
Thresholds 0.990 0.980 0.059 0.002 −0.027 22.754 (DF = 15); (P = 0.0895)
Thresholds and loadings 0.992 0.982 0.052 0.002 −0.007 3.579 (DF = 4); (P = 0.4659)
Thresholds, loadings, and residual variances 0.993 0.982 0.050 0.000 −0.002 9.655 (DF = 6); (P = 0.1399)
  1. Values under the column heading “Model Comparison” refer to the comparison of the model in the corresponding row and the model in the preceding row.
  2. CFI = comparative fit index; ΔCFI = change in CFI; DF = degrees of freedom; RMSEA = root mean square error of approximation; ΔRMSEA = change in RMSEA; TLI = Tucker-Lewis Index.