Table 1.

Maternal and infant characteristics

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