Table 1 Incident cases with CNS tumours by sex and histology, and overview of cases included in each analysis

	Incident cases ^b			Birth order ^c	Seasonality ^d	Childcare ^e
Histology ^a	Boys	Girls	Total	Total	Total	Total
Ependymoma	223	182	405	365	311	24
Astrocytoma	868	842	1710	1525	1128	128
PNET	412	280	692	648	519	49
Other gliomas	164	168	332	296	217	15
Other specified CNS tumours	304	237	541	497	378	37
Unspecified CNS tumours	163	140	303	269	218	65
Total	2134	1849	3983	3600	2771	348

Abbrevations: CNS=central nervous system; PNET=primitive neuroectodermal tumours.
^aClassified according to the international classification of childhood cancer, 3rd edition.
^bIncident cases of CNS tumours among children aged 0–14 years in Denmark, Norway, Finland, and Sweden in 1985–2006.
^cNumber of CNS tumour cases included in the analysis of birth order; in 43 cases, the mother could not be identified and in Finland, data was only available from 1987.
^dNumber of CNS tumour cases eligible for analysis of seasonal variation of birth. It includes patients born and diagnosed during 1985–2006.
^eNumber of cases eligible for analysis of childcare attendance. Born during 1985–2002 in Denmark and over 2 years of age.

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