Table 6 Results of tests for invariance in SBQ-ASC across gender and visual aids in the combined autistic/possibly autistic group, and non-autistic group
Model | Χ2 | df | Model fit | CFI | TLI | ΔM | Model difference | P | |
|---|---|---|---|---|---|---|---|---|---|
RMSEA | Δdf | Δχ2 | |||||||
Comparison of gender (combined autistic/possibly autistic group) | |||||||||
M1: Configural invariance (unconstrained) | 8.62 | 8 | .015 | .999 | .998 | Â | Â | Â | .375 |
M2: Metric invariance | 9.7 | 11 | .001 | 1 | 1 | M2–M1 | 3 | 1.08 | .782 |
M3: Scalar invariance | 11.03 | 12 | .001 | 1 | 1 | M3–M2 | 1 | 1.32 | .25 |
M4: Residual invariance | 12.02 | 16 | .001 | 1 | 1.01 | M4–M3 | 4 | .999 | .91 |
Comparison of visual aids (combined autistic/possibly autistic group) | |||||||||
M1: Configural invariance (unconstrained) | 5.58 | 8 | .001 | 1 | 1.01 | Â | Â | Â | .694 |
M2: Weak factorial/metric invariance | 7.31 | 11 | .001 | 1 | 1.01 | M2–M1 | 3 | 1.73 | .631 |
M3: Scalar invariance | 7.45 | 12 | .001 | 1 | 1.01 | M3–M2 | 1 | .147 | .7 |
M4: Strict invariance | 13.73 | 16 | .001 | 1 | 1 | M4–M3 | 4 | 6.27 | .18 |
Comparison of gender (non-autistic group) | |||||||||
M1: Configural invariance (unconstrained) | 19.38 | 6 | .093 | .98 | .933 | Â | Â | Â | .004 |
M2: Weak factorial/metric invariance | 23.68 | 9 | .08 | .978 | .951 | M2–M1 | 3 | 4.302 | .231 |
1M3: Scalar invariance | 24.28 | 10 | .074 | .979 | .957 | M3–M2 | 1 | .595 | .44 |
M4: Strict invariance | 42.46 | 14 | .089 | .957 | .939 | M4–M3 | 4 | 18.18 | .001 |
Comparison of visual aids (non-autistic group) | |||||||||
M1: Configural invariance (unconstrained) | 15.01 | 6 | .075 | .987 | .955 | Â | Â | Â | Â |
M2: Weak factorial/metric invariance | 18.31 | 9 | .062 | .986 | .969 | M2–M1 | 3 | 3.297 | .348 |
M3: Scalar invariance | 18.41 | 10 | .056 | .987 | .975 | M3–M2 | 1 | .105 | .746 |
M4: Strict invariance | 20.54 | 14 | .042 | .99 | .986 | M4–M3 | 4 | 2.132 | .711 |