Table 2. Invariance of Parent-rated IN, HI, and SCT at Preschool, Post-1st, Post-4th, and Post-9th Grades.
| Model tested | df | χ2 | p | Δdf | Δχ2 | p | CFI | TLI | RMSEA [90% CI] | MC | ΔCFI | ΔTLI | Pass? |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Null model | 4950 | 36649.9 | <.001 | – | – | – | – | – | – | – | – | – | – |
| Measurement model estimates | |||||||||||||
| 1: Configural invariance; correlated errors across like items | 4634 | 6191.7 | <.001 | – | – | – | .95 | .95 | .026 [.024, .028] | – | – | – | Yes |
| 2: Loading and threshold invariance (strong invariance) | 4829 | 6440.7 | <.001 | – | – | – | .95 | .95 | .026 [.024, .028] | 2 vs. 1 | .002 | .000 | Yes |
| Latent model estimates | |||||||||||||
| 3: Latent factor correlation invariance | 4838 | 6435.4 | <.001 | 9 | 16.1 | .064 | .95 | .95 | .026 [.024, .028] | 3 vs. 2 | .001 | .000 | Yes |
Note. IN=inattention; HI=hyperactivity/impulsivity; SCT=sluggish cognitive tempo; CFI=comparative fit index; TLI=Tucker-Lewis Index; RMSEA=root-mean-square error of approximation; CI=confidence interval; MC=model comparison; Pass=comparison meets invariance study criteria.