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. Author manuscript; available in PMC: 2015 Nov 1.
Published in final edited form as: J Perinatol. 2014 Dec 4;35(5):373–378. doi: 10.1038/jp.2014.217

Table 1.

Comparison of enrolled vs. non-enrolled patients

Variable* Enrolled (N=102) Eligible, Not enrolled (N=297) P value
Demographic
Maternal age, years 26 ± 6.5 28.2 ± 5.9 <0.01
Maternal education < high school 31 (34) 59 (23) <0.05
Maternal insurance status 0.03
 Private 26 (26) 119 (40)
 Public 72 (71) 165 (56)
 Self-pay/uninsured 3 (3) 8 (3)
 Other 0 (0) 5 (1)
Maternal race/ethnicity 0.70
 White 31 (31) 86 (28)
 Black 40 (39) 106 (36)
 Hispanic 25 (25) 79 (27)
 Other 6 (6) 27 (9)
Perinatal
Gestational age, weeks 27.0 ± 1.6 26.7 ± 1.7 0.09
Birth weight, grams 924.4 ± 222 875.4± 235.4 0.07
Small for gestational age 10 (10) 38 (13) 0.42
Male 54 (53) 147 (50) 0.5
Multiple gestation 22 (22) 85 (29) 0.17
Cesarean delivery 73 (72) 210 (71) 0.87
Antenatal steroids 89 (87) 255 (86) 0.78
5-minute Apgar <4 6 (6) 26 (9) 0.36
CPR in delivery room 10 (10) 22 (8) 0.44
Neonatal
FiO2 at 24 hours of life 0.29 ± 0.11 0.29 ± 0.13 0.85
On ventilator at 24 hours of life 53 (52) 151 (51) 0.87
High-frequency ventilator in first 72 hours of life 16 (16) 61 (21) 0.34
Early onset sepsis 3 (3) 7 (2) 0.75
Severe IVH or cPVL 22 (22) 48 (16) 0.22
BPD 33 (34) 101 (39) 0.44
NEC 6 (6) 21 (7) 0.67
ROP 44 (47) 149 (57) 0.09
Death before discharge 6 (6) 41 (14) 0.03

Definitions: severe intraventricular hemorrhage (IVH), cystic periventricular leukomalacia (cPVL), broncho pulmonary dysplasia (BPD), necrotizing enterocolitis (NEC), retinopathy of prematurity (ROP)

*

Data are expressed as mean ± standard deviation for continuous variables and n (%) for categorical variables

Percentages calculated after missing data removed from the denominator, as follows: maternal education (11 enrolled, 46 not enrolled), BPD (6 enrolled, 43 not enrolled), and ROP (8 enrolled, 41 not enrolled).