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Table 5 Goodness of fit indices for multi-group confirmatory factor analysis of unidimensional factorial structure of Swahili GAD-7

From: The reliability, validity and factorial structure of the Swahili version of the 7-item generalized anxiety disorder scale (GAD-7) among adults living with HIV from Kilifi, Kenya

Invariance model RMSEAa (95% CI) TLIb CFIb ΔCFIc Reference model
Sex
 1. Configural invariance 0.000 (0.000–0.018) 1.028 1.000
 2. Metric invariance 0.000 (0.000–0.038) 1.012 1.000  < 0.001 1
 3. Scalar invariance 0.000 (0.000–0.031) 1.015 1.000  < 0.001 2
Age
 1. Configural invariance 0.000 (0.000–0.036) 1.017 1.000
 2. Metric invariance 0.025 (0.000–0.057) 0.989 0.991 0.009 1
 3. Scalar invariance 0.032 (0.000–0.059) 0.982 0.983 0.008 2
  1. RMSE root mean square error of approximation, 95% CI–95% confidence interval, TLI Tucker–Lewis index, CFI-comparative fit index; Δ–change in
  2. aAcceptable fit ≤ 0.08, excellent fit ≤ 0.06
  3. bAcceptable fit ≥ 0.90, excellent fit ≥ 0.95
  4. cAcceptable cut-off to detect invariance ≤ 0.01