Table 5. Odds for death, by risk group (with bootstrap in estimating coefficient standard errors).

Risk group	OR (95% CI)	P Value
Low-risk group (<20 points)	(ref)
Medium-risk group (20–25 points)	5.09 (1.88, 13.81)	0.001
High-risk group (>25 points)	30.24 (10.93, 83.66)	<0.001