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Table 2 Test of measurement equivalences for Achievement Motive Index for Medical Treatment

From: Measuring motivation for medical treatment: confirming the factor structure of the Achievement Motivation Index for Medical Treatment (AMI-MeT)

Fit indexes χ2 df p χ2/df Δχ2 Δdf p’ CFI GFI AGFI AIC RMSEA
Configural invariance model 244.051 102 .000 2.393 - - - .911 .929 .886 370.051 .048
Weak invariance model 265.043 118 .000 2.246 20.992 16 .179 .908 .923 .893 359.043 .045
Strong invariance model 301.086 120 .000 2.509 57.035 18 .000 .887 .912 .878 391.086 .049
Complete invariance model 400.484 140 .000 2.861 156.433 38 .000 .837 .888 .868 450.484 .055
  1. Equivalences for AMI-Met were tested in sequence by placing constraints on the parameters (i.e., factor loadings, factor variances/covariance, and error variances). Configural invariance is the simplest form without any constraints on the parameters. Weak invariance constrains the factor loadings; strong invariance constrains the factor loadings and factor variances/covariance; and complete invariance constrains the factor loadings, factor variances/covariance, and error. The difference in the χ2 values (Δχ2) and the degrees of freedom (Δdf) were calculated as follows: Δχ 2 = χ 2 nested model − χ 2 configural invariance model, and Δdf = dfnested model − dfconfigural invariance model. p’ indicates the significance distributed from Δχ2 and Δdf [24]