Table 1.

Demographic characteristics of the study groups.

Characteristic	Patients ALL	Patients AML	Controls (UCB)
	N = 213	N = 85	N = 731
Male	127 (59.6%)	50 (58.8%)	365 (49.9%)
Female	86 (40.4%)	35 (41.2%)	366 (50.1%)
Median age (years)	10	12	NB
District of state of origin	DF = 111 (52.1%)	DF = 46 (54.1%)	Representativite of all Mexican geographical regions.
	Nuevo León = 53 (24.8%)	Nuevo León = 17 (20.0%)
	Puebla = 22 (10.3%)	Jalisco = 11 (12.9%)
	Jalisco = 12 (5.6%)	Puebla = 8 (9.4%)
	Coahuila = 5 (2.3%)	Others = 3 (3.5%)
	Others = 10 (4.7%)

ALL: acute lymphoid leukemia; AML: acute myeloid leukemia; UCB: umbilical cord blood; DF: federal district; NB: newborn.