Appendix Table 3.

Reclassification Table Comparing 30-Day Mortality Risk Strata for the Combined Comorbidity Score Versus the Romano/Charlson Score and the Combined Comorbidity Score Versus the van Walraven/Elixhauser Score in the Validation Cohort (NJ/PAAD)

Combined score	Romano/Charlson Score				van Walraven/Elixhauser Score
	Low*	Intermediate*	High*	Total	Low*	Intermediate*	High*	Total
Low*
No. included	99,985	5,320	25	105,330	100,318	4,976	36	105,330
Deaths	219	44	0	263	219	44	0	263
Non-deaths	99,766	5,276	25	105,067	100,099	4,932	36	105,067
Observed risk, %	0.2	0.8	0.0	0.2	0.5	4.4	4.0	0.2
Intermediate*
No. included	3,721	10,246	946	14,913	4,188	9,499	1,226	14,913
Deaths	72	267	24	363	77	239	47	363
Non-deaths	3,649	9,979	922	14,550	4,111	9,260	1,179	14,550
Observed risk, %	1.9	2.6	2.5	2.4	1.8	2.5	3.8	2.4
High*
No. included	47	1,371	2,194	3,612	52	1,367	2,193	3,612
Deaths	2	92	185	279	2	72	205	279
Non-deaths	45	1,279	2,009	3,333	50	1,295	1,988	3,333
Observed risk, %	4.3	6.7	8.4	7.7	3.8	5.3	9.3	7.7
Total
No. included	103,753	16,937	3,165	123,855	104,558	15,842	3,455	123,855
Deaths	293	403	209	905	298	355	252	905
Non-deaths	103,460	16,534	2,956	122,950	104,260	15,487	3,203	122,950
Observed risk, %	0.3	2.4	6.6		0.3	2.2	7.3

Note: light shading indicates an increase in risk category from the component score (i.e. Romano/Charlson or van Walraven) to the combined score and dark shading indicates a decrease in risk category.

^*Low- (<1%), intermediate- (1% to <4%), and high-risk (≥4%) strata are defined based on predicted probabilities of 1-year mortality among those who died (average predicted probability ~1%) and did not die (~4%) in the first 30 days of the follow-up year.