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Table 2 Comparison between groups

From: Influence of time under mechanical ventilation on bronchopulmonary dysplasia severity in extremely preterm infants: a pilot study

 Mild BPDModerate/severe BPDp
Maternal and gestational characteristics
 Tobacco use, yes (%)2 (8)4 (14,3)0,672
 Chorioamnionitis, yes (%)3 (12)5 (18,5)0,705
 Antenatal corticosteroids, yes (%)23 (92)20 (74,1)0,143
Perinatal variables
 Intubation in the delivery room, yes (%)12 (48)20 (71,4)0,072
 CPAP in the delivery room, yes (%)13 (52)8 (28,6)0,99
Outcomes during hospitalization
 Time under MV (days)19 [7,25–38]43 [33,25-52,75]< 0,001*
 CPAP before intubation, yes (%)12 (56)7 (25)0,043*
 RDS, yes (%)13 (76)24 (85,7)0,488
 Surfactant use, yes (%)18 (72)24 (85,7)0,313
 Pulmonary hypertension, yes (%)3 (12)12 (42,9)0,016*
 Pneumonia, yes (%)23 (92)28 (100)0,218
 ROP classification, n (%)
  013 (52)4 (14,3)0,009
  16 (16)11 (39,3)0,23
  24 (16,2)2 (7,1)0,31
  32 (8)11 (39,3)0,003a
 Corrective surgery for ROP, yes (%)1 (5,6)4 (15,4)0,634
 PDA, sim (%)22 (88)24 (85,7)1
 Drug treatment for PDA, yes (%)9 (40,9)11 (45,8)0,774
 Surgery for PCA, yes (%)2 (6,5)1 (4,2)0,6
 NEC, yes (%)3 (12)3 (10,7)1
 Surgery for NEC, yes (%)1 (33,3)2 (66,7)1
 Sepsis, yes (%)22 (88)26 (92,9)0,658
 VAD, yes (%)5 (20)2 (7,1)0,234
Variables at discharge
 Lenght of stay (days)81,5 [69,5-90,5]109 [99–118,25]< 0,001*
 GA at discharge (weeks)38 [36,25-38,75]41 [39–42,75]< 0,001*
 Weight at discharge (g)2031 [1868–2328]2620 [2045–3030]< 0,001*
 O2 discharge/transference, yes (%)0 (0)4 (14,3)0,115
  1. GA gestational age, g grams, Apgar 5′ Apgar score at fifth minute of life, M male, MV mechanical ventilation, CPAP continuous positive airway pressure, RDS respiratory distress syndrome, ROP retinopathy of prematurity, PDA patente ductus arteriosus, NEC necrotizing enterocolits, VAD vasoactive drugs, O2 oxygen; * p < 0,05; ap < 0,006