Table 2.

 Number of events and risk of in-hospital mortality in patients receiving different types of anesthesia. Values are risk ratios (95% confidence intervals) unless stated otherwise

Variables	General anesthesia	Regional anesthesia	General and regional anesthesia
No of patients	61 554	6939	4791
No of in-hospital deaths	1362	144	115
Risk of in-hospital death (%)	2.2	2.1	2.4
Unadjusted analysis	Ref	0.94 (0.79 to 1.11)	1.09 (0.90 to 1.32)
Adjusted analysis*	Ref	0.93 (0.78 to 1.11)	1.04 (0.85 to 1.26)
Fully adjusted analysis†	Ref	0.93 (0.78 to 1.11)	1.00 (0.82 to 1.22)
Mixed effects analysis‡	Ref	0.91 (0.75 to 1.10)	0.98 (0.79 to 1.21)

*Adjusted for age, sex, ethnicity, and calendar year.

†Included all covariates noted in table 1.

‡Hospital identifying variable was modeled as a normally distributed random intercept, and patient and hospital level characteristics were modeled as fixed effects variables.