Table 4.

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

ICCCb code(s)	Disease group	Geographical distancec (P-values)	NN thresholdd (P-values)
III(a)	Ependymoma	e	0.73
III(b)	Astrocytoma	0.75	0.63
III(a), III(b)	Ependymoma and Astrocytoma	0.94	0.87
III(c)	PNET	0.69	0.42
III(d)	Other gliomas	0.85	0.82
III(e), III(f)	Other Specified and Unspecified	0.53	0.26
III(a-f)	All CNS tumours	0.74	0.40

^aCases are close in time if dates of birth 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.