Table 2.

Results of Cox regression of overall survival on six cofactors.

Cofactor	P value	Hazard Ratio
Resection (Y/N)	0.0003	0.26
Actinomycin (Y/N)	0.0093	0.28
Age ≥ 2 years (Y/N)	0.0140	0.43
Male (Y/N)	0.46	1.26
Radiation (Y/N)	0.94	0.97
Chemotherapy (Y/N)	0.99	1.01