Table 2. Factors affecting the length of NICU stay in infants with very low birth weight (VLBW) .

Probable factors	Results	P-value	Beta coefficient
The time of regaining initial birth weight (day)	15.51 ± 6.23	< 0.001	0.49
Total enteral nutrition intolerance	5.30 ± 11.08	0.08	0.23
Perinatal birth weight	1310.26 ± 804.26	0.92	0.005
Perinatal gestational age	30.51 ± 0.34	0.36	-0.04
Time of intravenous feeding (day)	10.55 ± 5.53	0.26	0.10
First minute Apgar score	6.63 ± 0.61	0.40	0.04
Fifth minute Apgar score	1.26 ± 8.26	0.98	0.004
Number of days for feeding withdrawal	1.36 ± 0.64	0.68	-0.03
Resuscitation support	65 (38.2)	0.99	0.001
Use of surfactant	40 (23.5)	0.87	0.01
Vomiting	12 (7.1)	0.34	0.05
Gastric residual volume	48 (28.2)	0.98	-0.001
Abdominal distension	2 (1.2)	0.74	0.02
Positive blood culture during stay	12 (7.1)	0.001	0.30
Bloody or bile stained gastric remnants	2 (1.2)	0.001	0.23
Intrauterine growth retardation	13 (7.6)	0.007	0.15
Positive CRP during stay	6 (3.5)	0.001	0.21
Initial positive CRP	7 (4.1)	0.70	0.02
Initial positive blood culture	0	-	-
Suspected NEC	2 (1.17)	0.98	0.001
Confirmed NEC	0	-	-

CRP: C-reactive protein; NEC: Necrotizing enterocolitis

Values are presented as mean ± SD or number (%)