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Table 1 Maternal and infant characteristics

From: Neurodevelopmental outcome of extremely low birth weight infants at 24 months corrected age: a comparison between Griffiths and Bayley Scales

Characteristics Group 1 (n = 92) Group 2 (n = 102) C.I. 95 % of differences
Maternal
Age, years (mean) 34.2 34.4 −1.22–1.65
University degree, % 23.9 33.3 −4.2–23.1
Non-Italian nationality % 19.6 19.6 −12.2–12.2
Infant
Birth weight, g, (mean) 796.0 813.3 −18.2–49.4
GA, weeks, (mean) 27.7 27.2 −0.1–1.1
Males, % 43.5 44.1 −14.4–15.6
SGA, % 50.0 38.2 −3.1–2.74
Multiple birth, % 18.5 38.2 6.3–33.16
Cesarean delivery, % 92.4 92.2 −8.3–8.7
Sepsis, % 37.0 27.5 −4.7–23.7
NEC stage 2–3, % 2.2 4.9 −3.5–8.9
IVH grade 3–4, % 2.2 5.9 −2.8–10.2
PVL, % 1.1 2.0 −3.6–5.4
BPD, % 43.4 35.3 −6.6–22.9
ROP grade 3–4, % 16.3 14.7 −9.6–12.8
Days in hospital, (mean) 95.2 104.2 −3.7–21.6
Days on ventilation, (mean) 14.3 12.4 −2.8–6.5