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Table 1: Characteristics of preterm samples and term reference sample^{^a}
Birth and Maternal Data Full Preterm Sample with Early MRI (n = 83) Preterm Sample with Additional Term MRI (n = 77) Term Reference Sample (n = 38)
Gestational age at birth (wk) 28⁺⁴ [26⁺⁶–29⁺³], 23⁺⁶–30⁺⁶ 28⁺⁵ [26⁺⁶–29⁺³], 23⁺⁶–30⁺⁶ 39⁺⁶ [39–40⁺³], 38⁺²–41⁺³
Birth weight (g) 1068 (312), 494−1886 1076 (322), 494−1886 3509 (317), 2932−4330
Birth head circumference (cm) 25.62 (2.38), 20.5–30.5, n = 80 25.64 (2.43), 20.5–30.5, n = 75 34.71 (1.12), 32.5–37, n = 31
Males 49 (59%) 46 (60%) 19 (50%)
Multiple births 24 (29%) 21 (27%) 0 (0%)
Premature rupture of membranes 19 (23%) 18 (23%) 4 (12%) n = 33
Cesarean delivery 60 (72%) 56 (73%) 9 (27%) n = 33
Chorioamnionitis 14 (17%) 13 (17%) 
Antenatal steroids 62 (75%) 57 (74%) 
Magnesium sulphate 43 (65%), n = 66 41 (65%), n = 63 
Higher social risk 40 (48%) 34 (44%) 5 (16%) n = 31
Note:—IQR indicates interquartile range.
↵a Early MRI, 29 to 35 weeks PMA; term MRI, 40 to 42 weeks PMA. Data are No. (%), median [IQR] or mean (SD), range.