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Table 3 Goodness-of-fit indices and model comparison

From: Validation of the German version of the insomnia severity index in adolescents, young adults and adult workers: results from three cross-sectional studies

Study 1 CFI TLI NFI PClose RMSEA p(Δχ2)
1-Factor Modela       
Default model 0.98 0.96 0.98 0.94 .04 (.03, .05) ---
 + Configural invariance across genders 0.98 0.96 0.97 0.96 .04 (.03, .05) .084
 + Weak invariance across genders 0.98 0.97 0.97 0.99 .04 (.03, .05) .284
 + Strong invariance across genders --- --- --- --- --- .000
 + Strict invariance across genders --- --- --- --- --- ---
Study 2 CFI TLI NFI PClose RMSEA p(Δχ2)
1-Factor Model1       
Default model 1.00 1.00 1.00 1.00 .00 (.00, .03) ---
 + Configural invariance across genders 1.00 1.00 1.00 1.00 .01 (.00, .03) .072
 + Weak invariance across genders 1.00 1.00 1.00 1.00 .02 (.00, .04) .058
 + Strong invariance across genders 1.00 1.00 1.00 1.00 .02 (.00, .04) .124
 + Strict invariance across genders --- --- --- --- --- .003
Study 3 CFI TLI NFI PClose RMSEA p(Δχ2)
1-Factor Modela       
Default model 1.00 1.00 0.99 0.99 .00 (.00, .04) ---
 + Configural invariance across genders 1.00 1.00 0.99 0.98 .00 (.00, .04) .121
 + Weak invariance across genders 1.00 1.00 0.98 0.98 .00 (.00, .04) .116
 + Strong invariance across genders 1.00 1.00 0.98 1.00 .00 (.00, .04) .855
 + Strict invariance across genders 1.00 1.00 0.97 1.00 .00 (.00, .04) .417
  1. AGFI adjusted goodness of fit index, CFI comparative fit index, TLI Tucker Lewis index, RMR root mean square residual, PClose probability of close fit, RMSEA root mean square error of approximation
  2. ae1-e2, e1-e3, e2-e3, e5-e6, e5-e7, e6-7 were allowed to correlate