Table 6.

Multivariate logistic analyses of risk factors for multidrug−resistant bacterial infections in the training cohort.

Variables	β	S.E	Z	P	OR (95%CI)
						Intercept	-3.822	0.952	-4.014	<.001	0.022 (0.003 ~ 0.141)
Secondary surgery	18.299	1159.105	0.016	0.987	88510929.166 (0.000 ~ Inf)
Hospital stays	0.028	0.013	2.150	0.032	1.029 (1.002 ~ 1.055)
Preoperative WBC (×109/L)	-0.763	0.269	-2.841	0.004	0.466 (0.275 ~ 0.789)
Preoperative N (×109/L)	0.818	0.278	2.943	0.003	2.266 (1.314 ~ 3.908)
Postoperative WBC (×109/L)	0.301	0.062	4.879	<.001	1.351 (1.197 ~ 1.525)
Postoperative CRP (mg/L)	0.012	0.004	3.259	0.001	1.012 (1.005 ~ 1.019)

OR, Odds Ratio; CI, Confidence Interval.