Table 4

The adjusted association between increasing weekly work hours and resident physician-reported adverse safety outcomes

	Weekly work hours (n=person months)
	≤60 n=27 989	>60 and ≤70 n=17 175	>70 and ≤80 n=19 221	>80 n=13 716	P value
Attentional failures	Ref	1.71 (1.60 to 1.81)	2.25 (2.12 to 2.39)	3.50 (3.28 to 3.73)	<0.001
Medical errors	Ref	1.82 (1.71 to 1.94)	2.53 (2.38 to 2.68)	3.58 (3.36 to 3.82)	<0.001
PAE	Ref	2.13 (1.79 to 2.53)	2.66 (2.26 to 3.14)	3.89 (3.27 to 4.63)	<0.001
Fatal PAE	Ref	1.75 (1.16 to 2.64)	2.69 (1.84 to 3.94)	2.39 (1.59 to 3.59)	<0.001

All models are adjusted for age, gender, specialty, community versus university programme, hours in patient care and cohort. Created by the authors.
PAE, preventable adverse event; Ref, reference.