Table 1. Clinical characteristics of GBM patients according to their low or high risk group in the training set, the testing set and the entire patient set.

Characteristic	Training set		p-value *	Testing set		p-value *	Entire patient set		p-value *
	Low risk (N = 69)	High risk (N = 42)		Low risk (N = 68)	High risk (N = 43)		Low risk (N = 137)	High risk (N = 85)
Age (Mean ± SD)	51.5±6.6	54.4±1.9	0.5	54±12.7	58.3±10.2	0.1	52.8±14.8	56.4±11.2	0.1
Gender
Female (%)	26 (37.7)	13 (31)	0.5	27 (39.7)	12 (27.9)	0.2	53 (38.7)	25 (29.4)	0.2
Male (%)	43 (62.3)	29 (69)		41 (60.3)	31 (72.1)		84 (61.3)	60 (70.6)

*Two-tailed p-value obtained from Mann-Whitney test.