Composition and risk assessment of perioperative patient safety incidents reported by anesthesiologists from 2009 to 2019: a single‐center retrospective cohort study

Table 1 ASA physical status of patients with reported incidents

ASA	No. of patients with incidents	No. of patients without incidents	% of patients with incidents	Risk ratio (95% CI)
I	78	105,467	0.074	1.00
II	253	118,620	0.213	2.88 (2.24 to 3.72)*
III	89	14,332	0.617	8.40 (6.19 to 11.39)*
IV	37	981	3.635	51.00 (34.31 to 75.80)*
V	5	78	6.024	86.68 (34.16 to 219.91)*

*p < 0.05. CI: confidence interval. ASA: American Society of Anesthesiologists
Since the ASA data of patients without incidents were available only after 2013 due to technological issues (the electronic anesthesia record system in PUMC Hospital was established in 2013, so the ASA status of patients without reported incidents could only be collected after 2013), only data from 2013 to 2019 were used for the analysis related to ASA status