TABLE 5.

Correlations (first data column) and standardised regression coefficients (remaining columns) based on the structural equation model portrayed in Figure 1 for the measures derived from controlled sentence production

	Age			Cognitive ability
	Total	Unique	Gf	Memory	Speed	Vocabulary
Proportion valid sentences (All participants, N = 399)
Right stems	−.16*	−.16	.09	.31*	−.18	.25*
Left stems	−.33*	−.36*	.04	.09	.06	.46*
Left/right	−.27*	−.31*	−.01	−.09	.18	.37*
(Only participants with proportion >.79 for right-branching stems, N = 314)
Right stems	−.08	−.10	.03	.15	−.10	.11
Left stems	−.33*	−.45*	−.01	.04	.06	.49*
Left/right	−.31*	−.43*	−.02	−.01	.08	.47*

Note: Left/right refers to the residual of the variable with the left-branching stems after partialling the influence of the same variable with the right-branching stems.

^*p <.01.