TABLE 1.

Characteristics of study subjects

		Children (age 0‐14 years)		AYAs (age 15‐39 years)	P‐value a
	N	%	N	%
Total number of patients	2,254	100.0	2,905	100.0
Sex
Male	1,232	54.7	1,719	59.2	.001
Female	1,022	45.3	1,186	40.8
Histological type
Acute lymphoblastic leukemia	1,429	63.4	648	22.3	<.001
Acute myeloid leukemia	557	24.7	1,337	46.0
Chronic myeloid leukemia	77	3.4	611	21.0
Other leukemias	191	8.5	309	10.6
Period at diagnosis
1975‐1981	540	24.0	638	22.0	.023
1982‐1987	434	19.3	484	16.7
1988‐1993	349	15.5	480	16.5
1994‐1999	319	14.2	450	15.5
2000‐2005	320	14.2	418	14.4
2006‐2011	292	13.0	435	15.0
Treatment hospital
Designated cancer care hospitals	1,369	60.7	1,626	56.0	<.001
Nondesignated hospitals	885	39.3	1,279	44.0

Abbreviation: AYAs, adolescents and young adults.

^aComparisons between children and AYAs using chi‐square test.