Table 3.

Median survival time for the four severity groups according to the number of risk factors shown at presentation

	Risk Factors	n	Median Survival Time (95% CI)	IQR	Statistical Comparison
Very low	None	63	nd	nd	A
Low	1 or 2	114	1,977 (nd)	nd	A
Intermediate	3 or 4	57	1,013 (17–2,009)	312–1,954	B
High	5 or more	10	167 (19–314)	96–980	C
Overall		244	1,977 (1,751–2,202)

A significant difference between the groups is indicated by different letters.

CI, confidence interval; IQR, interquartile range; nd, not determined.