Table 2.

Observed mortality, predicted mortality, observed to expected mortality ratios, and adjusted mortality in patients operated on by newly appointed surgeons according to year after appointment

Year	Observed mortality (%) (95% CI)	Mean EuroSCORE (median; 25th, 75th centiles)	O:E ratio*	Adjusted mortality (%)†
1	2.2 (1.6 to 3.0)	3 (3; 1, 4)	0.73	2.3
2	2.1 (1.5 to 3.0)	3.1 (3; 1, 4)	0.68	2.2
3	1.6 (0.9 to 2.3)	3.1 (3; 1, 5)	0.52	1.7
4	1.2 (0.5 to 2.1)	3.3 (3; 1, 5)	0.36	1.0
P value‡	0.049	0.03	<0.001	0.019

^*Ratio between observed and expected (predicted) mortality is indicator of overall quality of care adjusted for risk.

^†Adusted for time and case mix.

^‡Significance for trend over time.