Table 1.

Characteristics of participants and non-participants

	Participants (n = 25)	Non-participants (n= 59)
Median age (range) in years	18 (8–33)	18 (3–34)
Gender
Male	19	30
Female	6	29
Malignancy
Precursor-B-ALL	17	46
T-ALL	6	9
Unclassified	2	4
Median age at SCT (range)	11 (2–18)	7 (1–18)
Source of stem cells
Bone marrow	17	38
Peripheral blood stem cells	8	21
Donor
Related	4	22
Unrelated	21	37
Stage of disease
CR1	16	18
CR2	9	36
CR3	-	5

Ratio male: female of participants was 3.2:1 in comparison to all eligible subjects of 1.4:1. The ratio CR:CR2 of participants was 1.77:1 in comparison to all eligible subjects of 0.74:1