Table 4.

Multiple linear and logistic regression analysis of the relationship between the demographic and surgical variables shown in Table 1 and the studied outcomes.

Morbidity	Factors in multivariate analysis	Relative risk (95% CI)	P-value
AKI (0/1)	MAP baseline (mmHg)	1.077 (1.020–1.139)	0.008
	Respiratory infection (0/1)	4.57 (1.19–17.59)	0.027
Paralytic ileus (days)	Infused Ringer (per 1 L)	2.25 (1.99–2.54)	<0.001
	BMI (per kg/m2)	0.94 (0.92–0.97)	<0.001
	FRI (continuous value)	1.16 (1.08–1.25)	<0.001
	Age (per year)	1.013 (1.006–1.020)	<0.001
	MAP surgery (mmHg)	1.018 (1.052–1.026)	<0.001
	ASA class (per grade)	1.38 (1.052–1.026)	<0.001
	Blood loss (per 100 mL)	0.90 (0.84–0.97)	<0.004
Food intolerance (days)	Infused Ringer (per 1 L)	3.99 (3.08–5.16)	<0.001
	BMI (per kg/m2)	0.91 (0.87–0.95)	<0.001
	FRI (continuous value)	1.34 (1.18–1.52)	<0.001
	Age (per year)	1.023 (1.011–1.035)	<0.001
	MAP surgery (mmHg)	1.032 (1.018–1.047)	<0.001
	ASA class (per grade)	2.07 (1.51–2.82)	<0.001
	Blood loss (per 100 mL)	0.79 (0.70–0.90)	<0.001
Respiratory infection (0/1)	Operating time (min)	1.003 (1.001–1.005)	0.022
	Pulmonary surgery (0/1)	7.51 (4.16–13.58)	<0.001
	Food intolerance (days)	1.126 (1.029–1.232)	0.01
	Age (year)	1.037 (1.020–1.056)	<0.001
	Urine flow (mL/min)	0.86 (0.77–0.96)	0.006
	GI surgery (0/1)	2.23 (1.22–4.09)	0.009
Wound infection (0/1)	Laparoscopic / Open (0/1)	6.03 (3.37–10.78)	<0.001
	Operating time (min)	1.005 (1.001–1.009)	<0.001
	Orthopedic surgery (no/yes)	2.67 (1.33–5.37)	0.006
	Food intolerance (days)	1.24 (1.09–1.41)	<0.001
	Fever (0/1)	1.90 (1.09–3.32)	0.024
	Paralytic ileus (days)	0.74 (0.56–0.98)	0.035
Fever (0/1)	GI surgery (0/1)	0.18 (0.10–0.30)	<0.001
	Respiratory infection (0/1)	2.78 (1.87–4.14)	<0.001
	Paralytic ileus (days)	1.32 (1.10–1.57)	0.002
	Wound infection (0/1)	2.10 (1.22–3.60)	0.007
	FRI > 4.0 (0/1)	2.10 (1.10–4.00)	0.024

The variables are presented in the order they were included in the stepwise regression.