Table 6.

Linear mixed effect models predicting growth in Total Language Composite z‐scores from Year 1 and Year 3. Growth estimates (Group × Age interaction coefficients) are relative to the TD group. Model 1 = unadjusted, Model 2 = adjusted for individual covariates, Model 3 = Adjusted including interactions between covariate and age

	Model 1 β (95% CI)	Model 2 β (95% CI)	Model 3 β (95% CI)	Model 3 p‐value
z‐scores model
Age	.001 (−0.002, 0.004)	.001 (−0.002, 0.004)	−.002 (−0.011, 0.006)	.611
SDQ		−.127 (−0.202, −0.052)	−.128 (−0.202, −0.053)	.001
IDACI		.107 (0.035, 0.178)	.107 (0.036, 0.178)	.003
NVIQ		.365 (0.302, 0.428)	.365 (0.302, 0.427)	<.001
Group
LD‐only	−1.597 (−1.727, −1.466)	−1.269 (−1.394, −1.146)	−1.269 (−1.393, −1.146)	<.001
LD+plus diagnosis	−2.268 (−2.479, −2.058)	−1.458 (−1.708, −1.208)	−1.459 (−1.709, −1.208)	<.001
Group × age
LD‐only	.009 (−0.001, 0.020)	.009 (−0.001, 0.020)	.010 (−0.001, 0.021)	.069
LD+plus diagnosis	.004 (−0.011, 0.018)	.004 (−0.011, 0.018)	.005 (−0.013, 0.022)	.607
SDQ × age			−.001 (−0.006, 0.004)	.808
IDACI × age			.001 (−0.002, 0.005)	.496
NVIQ × age			−.001 (−0.004, 0.003)	.930
Constant	−.119 (−0.202, −0.036)	−.270 (−0.443, −0.097)	−.271 (−0.444, −0.098)	.002