Table I.

Comparison of patient and treatment characteristics between participants and non-participants

	Participants		Non-Participants		p-value
	N (161)	%	N (271)	%
Sex					0.89
Male	72	44.7	123	45.4
Female	89	55.3	148	54.6
Age at Diagnosis					0.99
<1 year	5	3.1	8	3.0
1–10 years	129	80.1	218	80.4
>10 years	27	16.8	45	16.6
Risk Group					0.53
Low	66	41.0	107	39.5
Standard/High	92	57.1	162	59.8
Immunophenotype					0.94
B lineage	141	87.6	237	87.4
T Lineage	20	12.4	33	12.2
Mixed	0	0.0	1	0.4
Chemotherapy Treatment
Vincristine	160	99.4	267	98.5	0.42
High Dose Methotrexate	126	78.3	199	73.4	0.26
Intrathecal Methotrexate	161	100	271	100	1.00
Prednisone	155	96.3	261	96.3	0.98
Dexamethasone	34	21.1	46	17.0	0.28
Cranial Radiation					0.29
Yes	19	11.8	42	15.5
No	142	88.2	229	84.5