Table 2.

Univariate survival analysis (Kaplan-Meier): survival times according to clinicopathological features and the Bmi-1 gene expression.

	Case	Mean survival time  (months ± s.e.)	Chi-square	P value
Bmi-1 expression			5.87	0.015
High expression	24	20.31 ± 3.84
Low expression	32	39.65 ± 5.90
Sex			0.038	0.845
Male	30	35.28 ± 7.43
Female	26	28.65 ± 4.25
Embryonal/gliomas			1.88	0.17
Embryonal	16	36.23 ± 6.06
Gliomas	40	23.53 ± 4.01
Tumor grade			6.41	0.011
High grade	26	24.62 ± 5.52
Low grade	30	34.44 ± 3.23
Tumor type			1.43	0.21
Medulloblastoma	11	28.41 ± 4.47
Astrocytomas	19	27.76 ± 5.44
Ependymomas	16	19.46 ± 4.48
Other	10	31.38 ± 7.77