Table 4.

Hierarchical regressions exploring white matter abnormality as a mediator in the relationship between birth group and language sub-domains.

		Birth group		White matter abnormality
		b coefficient (95% CI)	n	b coefficient (95% CI)	p
Phonological Awareness	Step 1	−1.5 (−2.5, −0.5)	.003
	2	−0.7 (−1.7, 0.4)	.19	−0.5 (−0.7, −0.2)	.001
Semantics	Step 1	−11.9 (−16.5, −7.3)	<.001
	2	−8.1 (−13.1, −3.0)	.002	−2.2 (−3.8, −0.7)	.005
Grammar	Step 1	−12.5 (−17.6, −7.4)	<.001
	2	−9.2 (−14.8, −3.5)	.002	−1.9 (−3.6, −0.3)	.02
Discourse	Step 1	−2.1 (−3.0, −1.2)	<.001
	2	−1.7 (−2.7, −0.7)	.001	−0.2 (−0.4, −0.1)	.01
Pragmatics	Step 1	−16.0 (−25.1, −7.0)	.001
	2	N/A		N/A

Note: Both steps are controlling for social risk. N/A = not applicable.