Table 4.

Summary of disease free survival by risk category.

Groups	No. of patients disease free/recurrence	Median DFS time (year)	HR (95% CI)	Cox P	Log-rank P
Training set
Low-risk	287/68	NR	1.00		<0.0001
Medium-risk	247/108	10.00 (8.14–11.93)	1.75 (1.30–2.38)	0.0003
High-risk	149/205	4.26 (3.32–4.92)	4.66 (3.54–6.14)	<0.0001
Testing set
Low-risk	151/26	NR	1.00		<0.0001
Medium-risk	133/45	10.77 (8.77–12.51)	1.98 (1.22–3.21)	0.006
High-risk	86/91	5.66 (3.72–7.43)	5.33 (3.44–8.27)	<0.0001

Abbreviations and definitions: DFS, disease free survival; HR, hazard ratio; CI, confidence interval; NR, not reached.