Table 3.
Fit Statistics for Multigroup Confirmatory Factor Models.
| χ2 | df | χ2/df | RMSEA [90% CI] | CFI | ΔCFI | Δdf | |
|---|---|---|---|---|---|---|---|
| Model 1 (Two factors based on wording) | |||||||
| Single group | |||||||
| 18–39 Years old group | 625.954 | 134 | 4.671 | .052 [.047, .056] | .933 | ||
| 40–59 Years old group | 724.787 | 134 | 5.409 | .048 [.045, .051] | .946 | ||
| 60–99 Years old group | 640.495 | 134 | 4.780 | .047 [.043, .051] | .945 | ||
| Measurement invariance | |||||||
| Configural invariance | 1991.249 | 402 | 4.953 | .028 [.027, .029] | .942 | ||
| Metric invariance (factor loadings) | 2080.191 | 434 | 4.793 | .028 [.026, .029] | .940 | .002 | 32 |
| Scalar invariance (intercepts) | 2311.662 | 470 | 4.918 | .028 [.027, .029] | .933 | .009 | 68 |
| Structural covariances (factor variances and covariances) | 2344.829 | 476 | 4.926 | .027 [.027, .029] | .932 | .010 | 74 |
| Strict invariance (invariance of residual variances of measured variables) | 2480.285 | 512 | 4.844 | .027 [.027, .029] | .928 | .014 | 110 |
| Model 2 (one factor, correlated errors based on wording) | |||||||
| Single group | |||||||
| 18–39 Years old group | 410.485 | 99 | 4.146 | .048 [.043, .053] | .957 | ||
| 40–59 Years old group | 460.386 | 99 | 4.650 | .044 [.040, .048] | .967 | ||
| 60–99 Years old group | 430.517 | 99 | 4.349 | .044 [.040, .049] | .964 | ||
| Measurement invariance | |||||||
| Configural invariance | 1301.398 | 297 | 4.382 | .026 [.025, .027] | .963 | ||
| Metric invariance (factor loadings) | 1405.739 | 331 | 4.247 | .025 [.025, .027] | .961 | .002 | 34 |
| Scalar invariance (intercepts) | 1638.076 | 367 | 4.463 | .026 [.025, .028] | .954 | .009 | 70 |
| Structural covariances (factor variances and covariances) | 1642.858 | 369 | 4.452 | .026 [.025, .028] | .954 | .009 | 72 |
| Strict invariance (invariance of residual variances of measured variables) | 1922.550 | 477 | 4.031 | .025 [.023, .026] | .947 | .016 | 180 |
| Model 3 (two factors, age effects) | |||||||
| Single group | |||||||
| 18–39 Years old group | 944.340 | 134 | 7.047 | .066 [.062, .070] | .889 | ||
| 40–59 Years old group | 1342.732 | 134 | 10.020 | .069 [.065, .072] | .890 | ||
| 60–99 Years old group | 1387.691 | 134 | 10.356 | .074 [.071, .078] | .864 | ||
| Measurement invariance | |||||||
| Configural invariance | 3674.761 | 402 | 9.141 | .040 [.039, .042] | .881 | ||
| Metric invariance (factor loadings) | 3755.021 | 434 | 8.752 | .039 [.038, .040] | .879 | .002 | 32 |
| Scalar invariance (intercepts) | 3983.037 | 470 | 8.475 | .039 [.038, .040] | .872 | .009 | 68 |
| Structural covariances (factor variances and covariances) | 3993.131 | 476 | 8.389 | .038 [.037, .040] | .872 | .009 | 74 |
| Strict invariance (invariance of residual variances of measured variables) | 4150.931 | 512 | 8.107 | .038 [.037, .039] | .868 | .013 | 110 |
Note. χ2 = adjusted chi-square fit statistic; df = degrees of freedom; RMSEA = root mean square error of approximation; CFI = comparative fit index; CI = confidence interval.