Table 2.

Baseline characteristics of infants admitted to a neonatal intensive care unit (NICU) in the Netherlands, born with a gestational age between 24⁺⁰ and 26⁺⁶ weeks between 2011 and 2017, compared with infants born between 2007 and 2009

	24 weeks			25 weeks			26 weeks			Total cohort
	2007–2009	2011–2017	P value	2007–2009	2011–2017	P value	2007–2009	2011–2017	P value	2007–2009	2011–2017	P value
	n=69	n=480		n=264	n=625		n=361	n=1016		n=694	n=2121
Birth weight (g)	705 (96)	687 (98)	0.172	806 (115)	789 (131)	0.068	869 (177)	880 (237)	0.445	829 (158)	810 (200)	0.020*
Sex (male)	38 (55.1)	257 (53.5)	0.913	152 (57.6)	358 (57.3)	0.994	195 (54.0)	560 (55.1)	0.764	385 (55.5)	1175 (55.4)	1.000
SGA	6 (8.7)	53 (11.0)	0.704	35 (13.3)	115 (18.4)	0.076	116 (32.1)	262 (25.8)	0.024*	157 (22.6)	430 (20.3)	0.205
Caesarean section	2 (2.9)	89 (18.5)	0.001*	33 (12.5)	205 (32.8)	<0.001*	166 (46.0)	510 (50.2)	0.140	201 (29.0)	804 (37.9)	<0.001*
Multiple birth	21 (30.4)	166 (34.6)	0.586	91 (34.5)	192 (30.7)	0.309	86 (23.8)	293 (28.8)	0.078	198 (28.5)	651 (30.7)	0.303

Birth weight is presented as mean (SD), and other variables are presented as N (%). SGA defined as birth weight below 10th percentile.¹⁸

*Significant at a 0.05 level.

SGA, small for gestational age.