Table 3.

Results of K-function space-time clustering analyses for place of birth and date of diagnosis^a

ICCCb code(s)	Disease group	Geographical distancec (P-values)	NN thresholdd (P-values)
III(a)	Ependymoma	e	0.51
III(b)	Astrocytoma	0.26	0.46
III(a), III(b)	Ependymoma and Astrocytoma	0.41	0.77
III(c)	PNET	0.10	0.21
III(d)	Other gliomas	0.43	0.39
III(e), III(f)	Other Specified and Unspecified	0.85	0.36
III(a-f)	All CNS tumours	0.53	0.48

^aCases are close in time if dates of diagnosis differ by <t, where t is in the range 0.1 year to 1.5 year.

^b International Classification of Childhood Cancer.

^cCases are close in space if distances between their locations differ by <s, where s is in the range 0.5-7.5 km.

^dCases are close in space if either one is within the distance to the N^th nearest neighbour of the other, where N ranges from 1-15.

^eToo few cases for analysis.