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Table 1 Main clinical variables in the two studied groups

From: Are high cumulative doses of erythropoietin neuroprotective in preterm infants? A two year follow-up report

  G1 G2 p
N = 59 N = 45
Female (n - %) 40 – 67.8 22 – 48.9 0.07
Twins (n - %) 12 – 20.3 15 – 33.3 0.176
Gestational age (M ± SD) wk 28.1 ± 1.7 28.3 ± 1.2 0.591
Birth weight (M ± SD) g 1110.8 ± 304.6 1099.8 ± 229.0 0.840
Vaginal delivery (n - %) 7 – 11.9 3 – 6.7 0.508
5’ Apgar score >7 (n - %) 56 – 94.9 42 -93.3 1.000
Prenatal steroid treatment (n - %) 31 – 52.5 26 – 57.8 0.692
Postnatal steroid treatment    
 n - % 8 – 13.6 6 – 13.3 1.000
 M ± SD, d 0.9 ± 2.4 1.9 ± 8.2 0.361
Surfactant treatment (n - %) 56 – 94.9 28 – 62.2 <0.01
CPAP (M ± SD), h 319.4 ± 311.4 274.4 ± 221.4 0.412
Conventional mechanical ventilation, (M ± SD), h 80.7 ± 121.2 60.0 ± 104.4 0.361
HFOV (M ± SD), h 54.8 ± 139.8 22.8 ± 92.7 0.187
O2 therapy (M ± SD), h 281.5 ± 395.1 330.0 ± 443.1 0.558
Inhaled nitric oxide(M ± SD), h 2.8 ± 15.5 3.9 ± 15.5 0.708
Bronchopulmonary dysplasia (n - %) 32 – 54.2 18 – 40.0 0.169
Indomethacin treatment (n - %) 7 – 11.9 1 – 2.2 0.133
Patent ductus arteriosus ligation (n - %) 4 – 6.8 0 – 0.00 0.131
Packed red blood cells transfusions    
 n - % 36 – 61.0 31 – 68.9 0.535
 M ± SD 1.4 ± 1.5 1.4 ± 1.5 0.850
Retinopathy of prematurity grade I-II (n - %) 37 – 62.7 20 – 44.4 0.075
Intracranial hemorrhage grade I-II (n - %) 22 – 37.3 28 – 62.2 0.017
Intracranial hemorrhage grade I (n - %) 6 – 10.2 6 – 13.3 0.759
Intracranial hemorrhage grade II (n - %) 16 – 27.1 22 – 48.9 0.026
Necrotizing enterocolitis (n - %) 1 – 1.7 0 – 0.0 1.000
  1. h hours