Table 1.

Maternal characteristics of infants born at 29 to 33 weeks’ GA in NRN centers from 2012 to 2013 by maternal receipt of insulin^a maternal

Characteristics	Mother received insulin (IDDM) N = 527	Mother did not receive insulin (no IDDM) N = 6,509	p-Valueb
Maternal age			–
Mean (SD)
< 25	67/527 (13)	21,11/6,507 (32)	<0.001
25–29	127/527 (24)	1,659/6,507 (26)	0.48
30–34	184/527 (35)	1,608/6,507 (25)	<0.001
35–39	108/527 (21)	825/6,507 (13)	<0.001
≥ 40	41/527 (8)	304/6,507 (5)	0.002
Maternal education			–
Less than high school degree	74/523 (14)	966/6,474 (15)	0.63
High school - degree/partial college	200/523 (38)	2347/6474 (36)	0.36
College degree or more	94/523 (18)	1,343/6,474 (21)	0.13
Unknown education status	155/523 (30)	1,818/6,474 (28)	0.45
Maternal race
Black	169 (32)	2,059 (32)	0.84
White	276 (52)	3738 (57)	0.02
Other	56 (11)	407 (6)	<0.001
Unknown	26 (5)	3,059 (5)	0.80
Hispanic ethnicity	89/527 (17)	914/6,503 (14)	0.07
≥1 prenatal visit	518/526 (99)	6,298/6,501 (97)	0.04
Multiple birth	125/527 (24)	1,931/6,509 (30)	0.004
Maternal hypertension	281/525 (54)	2,090/6,507 (32)	<0.001
Maternal hypertension existing before pregnancy or chronic hypertension	156/510 (31)	643/6,402 (10)	<0.001
Maternal hypertension not existing before pregnancyc	110/510 (22)	1,342/6,402 (21)	0.75
PROM (>18 h)	108/504 (21)	1,159/6,089 (19)	0.19
Chorioamnionitis	54/524 (10)	443/6,450 (7)	0.003
Maternal antenatal steroids	450/520 (87)	5,506/6,455 (85)	0.44
Cesarean delivery	397/527 (75)	4,056/6,508 (62)	<0.001

Abbreviations: CPAP, continuous positive airway pressure; GA, gestational age; IDDM, insulin-dependent diabetic mellitus mothers; No IDDM, no insulin-dependent diabetes mellitus; PROM, prolonged rupture of membranes.

^aAll data presented as n (%) unless otherwise specified.

^bComparisons by chi square, Fisher’s exact, or Student’s t-test where appropriate.

^cNew diagnosis of hypertension while pregnant without history of disease prior to pregnancy.