Table 2.

The impact of degree of prematurity on white matter microstructure

	PMA (cov GA)	GA (cov PMA)
Left arcuate FA	0.0002	0.0130
Right arcuate FA	0.0013	0.0612
Left cortico‐spinal FA	0.0001	0.3448
Right cortico‐spinal FA	0.0016	0.8370
Left superior longitudinal FA	0.0007	0.9995
Right superior longitudinal FA	0.0004	0.5590

We assessed the effect of age at scan and gestational age at birth on arcuate fasciculi, cortico‐spinal tracts, and superior longitudinal fasciculi FA. Showing FWE corrected P‐values from GLM testing (10,000 permutations). A: Between 39 and 46 postmenstrual weeks, significant development (measured by PMA at scan covaried GA at birth) occurs in the arcuate fasciculi, cortico‐spinal tract, and superior longitudinal fasciculi microstructure. B: Increased prematurity at birth (measured by GA at birth covaried PMA at scan) is significantly associated with lower term equivalent FA of left arcuate fasciculus and a nonsignificant trend is seen in the right arcuate fasciculus.