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Table 1: Descriptive characteristics of the cohort (N = 78)
PT without BI (n = 31) PT with BI (n = 47) P Value^{^a}
Birth GA (wk)^{^b} 28.2 ± 2.6 (22.9–32.0) 26.5 ± 2.6 (23.0–32.6) .007
Birth weight (kg)^{^b} 1.1 ± 0.3 (0.4–1.5) 0.9 ± 0.3 (0.4–1.5) .04
Days of life at MRI^{^b} 41.2 ± 17.6 (10.0–84.0) 49.1 ± 18.9 (15.0–93.0) .07
Apgar score at 1 min^{^c} 6 (4, 2–9) 4 (4, 1–9) .003
Apgar score at 5 min^{^c} 8 (3, 4–9) 7 (3, 3–9) .005
Postmenstrual age at MRI (wk)^{^b} 34.0 ± 1.9 (30.9–36.9) 33.5 ± 2.19 (28.4–37.0) .37
Weight at MRI (kg)^{^b} 1.7 ± 0.4 (0.8–2.7) 1.6 ± 0.5 (0.8–3.0) .37
Female (No.) (%) 17 (54.8) 25 (53.2) .89
Cesarean delivery (No.) (%) 23 (74.2) 28 (59.6) .18
↵a P value based on a t test for normally distributed continuous variables, the Wilcoxon-Mann-Whitney test for nonparametric continuous outcomes, and the χ² test for categoric outcomes.
↵b Mean (range).
↵c Median (interquartile range, range).