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Table 1 Maternal and infant characteristics

From: A clinical scoring system to predict the need for extensive resuscitation at birth in very low birth weight infants

Characteristics No extensive resuscitation (n = 5038) Extensive resuscitation (n = 260) P value
Gestational age (weeks) 28.96 ± 2.97 26.53 ± 2.52 <.001
Birth weight (g) 1087 ± 281 865 ± 290 <.001
Birth weight < 10th percentilea 1097 (21.9) 45 (17.6) 0.111
Birth weight < 3rd percentilea 529 (10.5) 16 (6.3) 0.029
Male 2520 (50.0) 150 (57.7) 0.016
Maternal age 32.78 ± 4.18 32.93 ± 4.20 0.572
In vitro fertilization 1104 (21.9) 46 (17.7) 0.107
Multiple births 1776 (35.3) 80 (30.8) 0.140
Maternal diabetes 411 (8.2) 17 (6.5) 0.350
Maternal hypertension 1076 (21.4) 36 (13.8) 0.004
Amniotic fluid    <.001
 Normal 4255 (84.5) 189 (72.7)  
 Oligohydramnios 702 (13.9) 55 (21.2)  
 Polyhydramnios 81 (1.6) 16 (6.2)  
Premature rupture of membrane 1775 (35.2) 100 (38.5) 0.288
Antenatal steroid    <.001
 None 1105 (21.9) 94 (36.2)  
 Incomplete 1584 (31.4) 70 (26.9)  
 Complete 2349 (46.6) 96 (36.9)  
Cesarean section 3880 (77.0) 195 (75.0) 0.452
Outborn 88 (1.7) 9 (3.5) 0.044
Chorioamnionitisb 1408 (33.0) 100 (44.2) <.001
Apgar score
 1-min 4.75 ± 1.97 1.66 ± 1.38 <.001
 5-min 6.95 ± 1.66 3.51 ± 2.11 <.001
  1. aCould not be calculated for 25 infants (20 with no extensive resuscitation, 5 with extensive resuscitation) due to gestational age being out of range for the growth chart used
  2. bNot collected for 804 infants (770 with no extensive resuscitation, 34 with extensive resuscitation)