Table 2.
Relative contributions of structural LNM-LL and functional LNM-LL to the prediction of latent growth curve intercept and slope parameters beyond LBM-LL and one another
| Model comparison | Chi-squared difference | ΔR2 12-month intercept | ΔR2 Slope |
|---|---|---|---|
| Boston Naming Test | |||
| sLNM-LL Over LBM-LL | 19.12** | 0.021 | 0.182 |
| fLNM-LL Over LBM-LL | 29.65* | 0.123 | 0.127 |
| sLNM-LL Over fLNM-LL | 36.00*** | 0.042 | 0.177 |
| fLNM-LL Over sLNM-LL | 30.47* | 0.129 | 0.064 |
| Complex Ideational Material Test | |||
| sLNM-LL Over LBM-LL | 24.9*** | 0.117 | 0.29 |
| fLNM-LL Over LBM-LL | 22.00** | 0.141 | 0.158 |
| sLNM-LL Over fLNM-LL | 33.63*** | 0.038 | 0.347 |
| fLNM-LL Over sLNM-LL | 30.79*** | 0.206 | 0.035 |
| Hopkins Verbal Learning Test Delayed Recall | |||
| sLNM-LL Over LBM-LL | 4.33 | −0.006 | 0.144 |
| fLNM-LL Over LBM-LL | 2.8 | 0.019 | 0.02 |
| sLNM-LL Over fLNM-LL | 8.59* | 0.021 | 0.142 |
| fLNM-LL Over sLNM-LL | 5.16 | 0.04 | 0.014 |
| Action Research Arm Test | |||
| sLNM-LL Over LBM-LL | 18.31* | 0.092 | 0.064 |
| fLNM-LL Over LBM-LL | 0.053 | 0.000 | 0.000 |
| sLNM-LL Over fLNM-LL | 42.99*** | 0.19 | 0.088 |
| fLNM-LL Over sLNM-LL | 3.78 | 0.012 | 0.003 |
*
P < 0.05, **P < 0.01, ***P < 0.001.
ΔR2 = Change in R2 from null model to alternative model; fLNM = functional LNM; sLNM = structural LNM.