Table 4.

Association between intensivist characteristics and selecting “Probably yes” or “Definitely yes” response to bringing up withdrawing life support^*

	Model 1 Complete cases only Risk Ratio N = 511	Model 2 Imputed covariates† Risk Ratio N = 630
Sex
Male	Ref	Ref
Female	1.11 (0.90,1.36)	1.15 (0.96,1.39)
Specialty
Medicine	Ref	Ref
Surgery	1.16 (0.94,1.43)	1.18 (0.97,1.43)
Anesthesia	0.72 (0.53,0.96)	0.81 (0.63,1.04)
Region of Residency
Northeast	Ref	Ref
Midwest	0.95 (0.75,1.20)	0.98 (0.79,1.22)
South	0.93 (0.74,1.18)	0.90 (0.72,1.12)
West	0.85 (0.61,1.18)	0.87 (0.66,1.15)
International	0.75 (0.36,1.57)	0.81 (0.44,1.48)
Years since residency
1 year increase	0.99 (0.98,1.00)	0.99 (0.98,1.00)
Survey
Control	Ref	Ref
Values	0.95 (0.72,1.26)	1.03 (0.81,1.32)
Prognosis	1.45 (1.13,1.85)	1.49 (1.20,1.85)

^*Model estimated using the COPY method with C = 1,000 and adjusted for scenario. Clustering of responses within intensivists accounted for using generalized estimating equations with an exchangeable correlation matrix.

^†Region of first residency was missing for 6.2% of intensivists and year of first residency completion was missing for 15.6%. Missing values were imputed using imputation for chained equations in model 2.