Age, Tumor Characteristics, and Treatment Regimen as Event Predictors in Ewing: A Children’s Oncology Group Report

Table 4

Estimated risk coefficients for multivariate analysis excluding extraosseous patients ( = 1231).

Factor	Characteristic	Relative risk	95% confidence interval	value compared to reference	Global value
Age yrs. (ref. ≤9)					0.0000
	10–17	1.24	0.98–1.55	0.070
	18+	2.14	1.59–2.87	0.000
Primary site (ref. nonpelvic)					0.0110
	Pelvic tumor	1.34	1.07–1.67	0.009
Treatment (ref. intensive timing)					0.0001
	Standard timing	1.13	0.86–1.48	0.384
	Non-I/E	1.84	1.33–2.53	0.000