Space-time clustering of childhood central nervous system tumours in Yorkshire, UK

BMC Cancer

Table 2 Results of K-function space-time clustering analyses for place of birth and date of birth^a

ICCC^b Code(s)	Disease group	Geographical distance^c (P-values)	NN threshold^d (P-values)
III(a)	Ependymoma	^e	0.49
III(b)	Astrocytoma	0.79	0.49
III(a), III(b)	Ependymoma and Astrocytoma	0.88	0.41
III(c)	PNET	0.42	0.52
III(d)	Other gliomas	0.52	0.17
III(e), III(f)	Other Specified and Unspecified	0.37	0.34
III(a-f)	All CNS tumours	0.10	0.14

^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

ISSN: 1471-2407