Table 1.

Clinical characteristics and blood gases per subject PND 1–7

	Total n=452
GA, weeks; mean (SD)	26.4 (1.8)
Birth weight, g; mean (SD)	876 (272)
BW SGA; n (%)	111 (24.6)
Mortality*; n (%)	61 (13.5)
Male; n (%)	260 (57.5)
Twins; n (%)	110 (24.3)
Triplets; n (%)	18 (4)
Morbidities
IVH grades 3–4; n (%)†	43 (9.9)
Any IVH; n (%)†	119 (27.4)
NEC; n (%)‡	23 (5.4)
BPD; n (%)§	213 (55.8)
CRIB-II score; mean (SD)¶	11.4 (3.3)

*Before 36 weeks’ PMA.

†435 available for analysis.

‡425 available for analysis.

§382 available for analysis.

¶212 available for analysis.

BPD, bronchopulmonary dysplasia; BW SGA, birth weight small for gestational age; CRIB-II, Clinical Risk Index for Babies scoring system II; GA, gestational age; IVH, intraventricular haemorrhage; n, number; NEC, necrotising enterocolitis; PMA, postmenstrual age; PND, postnatal day.;