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Table 3 Test of invariance of the proposed three-factor structure of the ERI-SQ between health courses (n = 2551) and other courses (n = 3897) students, and female (n = 4869) vs male students (n = 1579): results of multigroup confirmatory factor analyses

From: Stress among university students: factorial structure and measurement invariance of the Italian version of the Effort-Reward Imbalance student questionnaire

Model S-Bχ2 df rCFI rRMSEA rSRMR Nested Model ΔrCFI ΔrRMSEA ΔrSRMR
Health vs other courses
 Health 178.44 51 .959 .046 .032     
 Non-Health 218.51 51 .963 .041 .032     
 M0. Configural invariance 398.06 102 .962 .045 .032     
 M1. Metric invariance 417.12 111 .961 .044 .035 M1-M0 −.001 −.001 .002
 M2. Scalar invariance 822.39 120 .912 .063 .052 M2-M1 −.043 .019 .017
Female vs male students
 Female students 303.65 51 .956 .045 .032     
 Male students 141.59 51 .955 .047 .036     
 M0. Configural invariance 445.20 102 .956 .049 .033     
 M1. Metric invariance 465.98 111 .955 .047 .036 M1-M0 −.001 −.002 .003
 M2. Scalar invariance 547.82 120 .946 .050 .038 M2-M1 −.009 .003 .002
 M3. Uniqueness invariance 576.19 132 .941 .049 .040 M3-M2 −.005 −.001 .002
 M4. Structural invariance 666.14 135 .931 .053 .052 M4-M3 −.010 .004 .012
  1. df degrees of freedom, CFI Comparative Fit Index, RMSEA Root Mean Square Error Of Approximation, SRMR Standardized Root Mean Square Residual