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Table 2: Characteristics of preterm samples and term reference sample^{^a}
Acquired Medical Factors From Birth to Early MRI (n = 83) From Birth to Term MRI (n = 77) Term Reference Sample (n = 38)
Patent ductus arteriosus 39 (47%) 36 (47%) 
IVH 17 (20%) 16 (21%) 
IVH grade 3 or 4 4 (5%) 4 (5%) 
Periventricular leukomalacia 2 (2%) 2 (3%) 
Hydrocephalus 2 (2%) 2 (3%) 
NEC diagnosed or suspected 3 (4%) 2 (3%) 
Confirmed sepsis 3 (4%) 2 (3%) 
Total parenteral nutrition (days) 11 [8–14], 0–30 11 [8–14], 0–30 
Postnatal corticosteroids 14 (17%) 14 (18%) 
Ventilation (days) 3 [0–12], 0–48 2 [0–12], 0–48 
CPAP (days) 15 [7–25], 0–47 30 [7–47], 0–81 
Oxygen therapy (hr) 12 [1–125], 0–1515, n = 69 29 [2–370], 0–3912, n = 67 
36-week PMA O₂ requirement 23 (30%) 
PMA at MRI (wk) 32⁺² (1⁺³), 29⁺³–35⁺² 40⁺⁶ (1⁺³), 38⁺³–46⁺⁴ 41⁺³ (1), 39⁺²–44
Weight at MRI (g) 1500 (352), 883–2715 Early MRI 1505 (359), 883–2715 3428 (378), 2500–4200, n = 31
Term MRI 3127 (627), 1900–5150 
Note:—IVH indicates intraventricular hemorrhage; NEC, necrotizing enterocolitis; CPAP, continuous positive airway pressure.
↵a Data are No. (%), median [IQR] or mean (SD), range. Early MRI, 29 to 35 weeks PMA; term MRI, 40 to 42 weeks PMA.