Table 4.

Relative excess risk of death comparison by case volume status

	High-volume	Medium-volume		Low-volume
	RER reference	RER (95% CI)	p value*	RER (95% CI)	p value*
2000–2006
All patients	1.0	1.01 (0.85–1.19)	0.948	1.18 (1.00–1.39)	0.089
≤ 70 years	1.0	0.99 (0.81–1.20)	0.913	1.15 (0.95–1.38)	0.380
> 70 years	1.0	1.06 (0.75–1.49)	0.869	1.30 (0.93–1.82)	0.380
2007–2013
All patients	1.0	0.99 (0.85–1.16)	0.948	1.19 (1.03–1.37)	0.062
≤ 70 years	1.0	0.97 (0.81–1.17)	0.869	1.22 (1.04–1.44)	0.141
> 70 years	1.0	1.06 (0.79–1.41)	0.869	1.11 (0.85–1.45)	0.869
2000–2013
All patients	1.0	1.02 (0.91–1.15)	0.690	1.19 (1.07–1.32)	0.002
≤ 70 years	1.0	1.00 (0.88–1.15)	0.952	1.20 (1.06–1.35)	0.016
> 70 years	1.0	1.08 (0.87–1.35)	0.655	1.18 (0.95–1.45)	0.266

Values over one indicates a higher relative risk of death compared to the reference. Values under one indicate a lower relative risk of death compared to the high-volume hospital (reference)

RER relative excess risk of death

*p value for the difference to high-volume adjusted for multiple comparisons