Table 5.

Bivariate correlations among the variables included in the regression analyses.

Measure	2	3	4	5	6	7
1. CDI-EV at 24 months	−0.46*	0.64**	0.64**	0.61**	0.65**	0.76**
2. CA at onset of declarative pointing		−0.79**	−0.60**	−0.84**	−0.81**	−0.59**
3. CDI-EV at 48 months			0.88**	0.93**	0.92**	0.82**
4. CDI-SC at 48 months				0.81**	0.77**	0.84**
5. PPVT-4 SS at 48 months					0.95**	0.78**
6. EVT-2 SS at 48 months						0.78**
7. MSEL-ELC at 48 months

CDI-EV, MacArthur-Bates Communicative Development Inventory: Words and Sentences expressive vocabulary size; CA, chronological age; CDI-SC, MacArthur-Bates Communicative Development Inventory: Words and Sentences sentence complexity score; PPVT-4, Peabody Picture Vocabulary Test-4; EVT-2, Expressive Vocabulary Test-2; MSEL-ELC, Mullen Scales of Early Learning Early Learning Composite; SS, standard score.

^*p < 0.01,

^**p < 0.001.