Table 2.

Means, standard deviations, and correlations with confidence intervals of the predictor variables in both models. The mean and standard deviation values for the vocabulary measures are reported as proportions.

Variable	M	SD	1	2	3
1. SBC stress rate	1.71	0.97
2. SBC syllable rate	1.47	0.86	.25
			[−.05,.51]
3. Receptive voc. 10 months	0.26	0.18	-.02	.40**
			[−.31,.29]	[.11,.63]
4. Expressive voc. 10 months	0.02	0.03	.25	.03	.39**
			[−.05,.51]	[−.28,.32]	[.10,.62]

Note. Values in square brackets indicate the 95 % confidence interval for each correlation. ***p < .001, **p < .01, p < *.05.

1: Speech-brain coherence at the stress rate (z-score)

2: Speech-brain coherence at the syllable rate (z-score)

3: Receptive vocabulary at 10 months