Table 2.

Parameters for the rate of different words (RDW) model.

Different words model effects	Model 1
	Est	SE	p <
Rate of different words model for the means
Intercept	11.594	10.899	.287
Linear age slope (0 = 10 years)	0.303	1.205	.801
Quadratic age slope	−0.123	0.012	.001
Leiter IQ (0 = 52)	0.118	0.052	.023
Leiter IQ by linear	−0.003	0.010	.780
Leiter IQ by quadratic	−0.001	0.001	.128
Maternal commenting rate model for the means
Intercept (0 = 3.5/min)	0.714	0.234	.002
Linear age slope (0 = 10 years)	0.338	0.026	.001
Quadratic age slope	0.009	0.004	.034
Rate of different words model for the variance
Random intercept variance	5.751	2.898	.047
Linear age slope variance	0.054	0.063	.396
Intercept–age slope covariance	0.555	0.418	.184
Residual variance	8.564	0.933	.001
Maternal commenting rate model for the variance
Random intercept variance	1.032	0.415	.013
Linear age slope variance	0.011	0.006	.068
Intercept–age slope covariance	0.095	0.051	.062
Residual variance	0.732	0.123	.001
Cross-variable regressions
Commenting intercept to RDW intercept	2.925	4.529	.518
Commenting age slope to RDW age slope	−1.117	4.453	.802
Commenting intercept to RDW age slope	0.248	0.465	.594
Commenting slope to RDW intercept	−11.946	40.867	.770
Within dyad
Commenting residual to RDW residual	0.945	0.277	.001
Total effect
Commenting intercept to RDW intercept	3.871	4.553	.395
Commenting age slope to RDW age slope	−0.172	4.431	.969

Note. This table contains the parameter estimates (Est) for each of the effects in the model, as well as the standard error (SE). The probability of each effect (p) is presented with significant values in bold. Leiter = Leiter International Performance Scale.