Table 6.

logistic regression for AKI

	Univariate	Multivariate
Variables	OR(95%CI)	P value	OR(95%CI)	P value
Age	1.00(0.92–1.09)	0.997	–	–
Sex	4.75(1.06–21.26)	0.042	1.98(0.36–10.80)	0.430
ASA grade
II	5.28(0.67–1.68)	0.114	3.49(0.39–31.44)	0.265
III	8.86(0.99–9.00)	0.051	3.05(0.26–35.62)	0.374
NYHA grade
II	1.51(0.46–4.97)	0.497	–	–
Operation type
colon	0.69(0.22–2.15)	0.525	–	–
rectum	0.85(0.29–2.49)	0.772	–	–
COPD	1.54(0.40–5.92)	0.528	–	–
diabetes	1.72(0.52–5.73)	0.375	–	–
TIA	1.13(0.35–3.65)	0.838	–	–
hypertension	2.50(0.99–6.23)	0.052	1.88(0.62–5.66)	0.264
Preoperative creatinine	1.04(1.00–1.07)	0.032	1.04(1.01–1.57)	0.028
Anesthesia time (min)	1.01(0.99–1.01)	0.213	–	–
Operation time (min)	1.01(0.99–1.01)	0.131	–	–
Mode of operation   (laparotomy/ Laparoscopic)	0.77(0.29–2.04)	0.598	0.66(0.22–1.93)	0.444
Introperative Liquid volume (ml)	1.00(1.00–1.01)	0.068	1.00(0.99–1.00)	0.446
Introperative urine volume (ml)	1.00(0.99–1.00)	0.990	–	–
Introperative Hb(g/L)	1.14(0.87–1.48)	0.344	–	–
Hypotension frequency	1.30(1.07–1.57)	0.009	1.28(1.04–1.57)	0.020
Duration of hypotension	1.03(0.99–1.07)	0.145	–	–

Factors of P < 0.10 in the univariate analysis were included in the multivariate analysis. All the variables for regression analysis were listed in the chart, among which preoperative creatinine and the frequency of intraoperative hypotension were significant risk factors for AKI in this study

OR Odds ratio