Table 2.

The information of patient risk classification scheme.

Risk level	Number of patients	CS1	CS2
0	10	Levels 0, 1, and 2 are class 1 (42 samples)	Levels 0 and 1 are class 1 (25 samples)
1	15
2	17		Levels 2 and 3 are class 2 (23 samples)
3	6	Levels 3, 4, 5, and 6 are class 2 (17 samples)
4	6		Levels 4, 5, and 6 are class 3 (11 samples)
5	4
6	1

CS: classification scheme.