Table 2.

Risk scores, mortality prediction and decision support messages for CARAT

Risk score	Predicted 2-year mortality	Decision support message
0 to 2	2%	Safe for Surgery
3-4	3%
5-6	5%
7-8	8%
9-10	13%
11-12	21%	Consider Surgery Carefully
13-14	34%
15-16	51%	Surgery May Not Be Indicated, Based on Limited Life Expectancy
17-18	70%
19-20	88%
>20	99%

Risk scores are calculated from the factors in Table 1.