Table 1. Number of cases and controls in this study.

	Number			Male/female
Study groupa	Total	Male	Female	ratio
Leukaemia	895	492	403	1.22
BCP ALL	687	373	314	1.19
Non-BCP leukaemia	208	119	89	1.33
Pro-B ALL	26	7	19	0.37
T ALL	75	51	24	2.12
AML	107	61	46	1.33
Solid tumour	409	218	191	1.14
Newborn controls	864	436	428	1.01

^aLeukaemias are classified as B cell precursor ALL (BCP ALL) and non-BCP acute leukaemia including Pro-B ALL, T ALL and AML.