Table 1.

Demographic information of neonates without magnetic resonance imaging abnormalities from two sites

	Site 1 (n = 42)	Site 2 (n = 42)	P
Gestational age (median and range, week)	40.00 (37.43–42.00)	39.71 (37.14–41.71)	0.25
Postmenstrual age (median and range, week)	41.00 (38.29–43.29)	41.07 (38.57–43.71)	0.82
Gender (male:female)	28:14	28:14	1.00
Birth weight (median and range, g)	3300 (1530–4415)	3375 (1250–4170)	0.36

Mann–Whitney U test is used to test the inter-site differences in the gestational age, the postmenstrual age, and the birth weight. Differences in the gender ratio are tested by using the Chi square test