Table 2. Clinical characteristics of risk factors for NEC (n=94).

Risk factors for NEC		Lactobacillus reuteri group (n=47)	Placebo group (n=47)	p-value
Gestational age (wk)		33 (28–34)	33 (28–34)	0.75
Birth weight (g)		1,520 (1,035–1,800)	1,605 (1,060–1,800)	0.73
Cesarean section		39 (83.0)	40 (85.1)	0.78
Steroid administration		35 (74.5)	35 (74.5)	1.00
	Length of steroid administration (d)	2 (0–4)	2 (0–2)	0.16
Asphyxia		38 (80.9)	42 (89.4)	0.25
Patent ductus arteriosus		2 (4.3)	3 (6.4)	1.00
APGAR score, 1 min		7 (5–9)	7 (3–9)	0.72
APGAR score, 5 min		9 (6–10)	9 (5–10)	0.34
Nutrition
	Age at first feeding (d)	2 (0–12)	1 (0–14)	0.79
	Predominant breast milk	9 (19.1)	10 (21.3)	0.80
	Predominant preterm formula milk	38 (80.9)	37 (78.7)	-
	Duration of total parenteral nutrition (d)	8 (0–35)	9 (0–69)	0.52
	Time to reach full feeding (d)	6 (0–25)	7 (0–63)	0.82
Age at intervention (d)		3 (0–18)	4 (0–21)	0.71
Duration of intervention (d)		21 (8–53)	21 (7–66)	0.78

Values are presented as mean (range) or number (%).

NEC: necrotizing colitis.