Assessment of bacterial positivity rate changes in anesthesia machine internal circuits within recovery rooms and associated risk factors

Table 3 Single-factor modified Possion regression analysis of risk factors of contamination in the internal circuits of anesthesia machines in PACUs

Variable	β	\(\:s\stackrel{-}{x}\)	Wald	P value	RR value	99%CI
Number of patients using anesthesia machine	0.022	0.017	1.727	0.189	1.023	0.979 ~ 1.068
Number of patients who were over 60 years old and used anesthesia machine	0.295	0.090	10.674	0.001	1.343	1.064 ~ 1.694
Number of patients who underwent laparoscopic surgery and used anesthesia machine	0.050	0.040	1.583	0.208	1.051	0.949 ~ 1.164
Number of patients who were in a lateral/prone position during surgery	0.041	0.025	2.697	0.101	1.042	0.977 ~ 1.111
Total surgical duration	0.001	0.000	18.331	0.000	1.001	1.000 ~ 1.001

Note β: regression coefficient \(\:s\stackrel{-}{x}\): Standard error; RR: Relative Risk; CI: Confidence interval

ISSN: 1471-2253