Table 2.

Description of all significant fever clusters (p ≤ 0.05) detected by the scan statistic during our test period (23 October 2005 to 21 May 2006)

Year	Week	Location	Number of PCTs involved	Observed calls (O)	Expected calls (E)	O/E	p-value
		(centroid PCT)	(radius in km)		[based on control period]
2005	47	Ashton, Leigh and Wigan	8 (20)	34	15	2.23	0.005
	48	Warrington	8 (22)	42	20	2.15	0.002
	49	North Lancashire	11 (61)	71	31	2.27	0.001
	49	Salford	19 (39)	100	57	1.75	0.001
	50	East Lancashire	29 (72)	214	125	1.71	0.001
	50	East and North Hertfordshire	2 (22)	18	5	3.33	0.001
	51	North Lancashire	50 (147)	394	245	1.6	0.001
	51	South Staffordshire	59 (125)	404	309	1.31	0.01
	52	Wirral	22 (71)	156	100	1.56	0.001
	52	Hull	72 (185)	347	278	1.25	0.008
2006	02	Derbyshire County	12 (50)	114	66	1.74	0.001
	03	Nottingham City	21 (75)	266	170	1.56	0.001
	03	Telford and Wrekin	20 (74)	191	135	1.42	0.001
	04	Leicester City	31 (92)	405	276	1.47	0.001
	04	Shropshire County	15 (64)	175	110	1.59	0.001
	04	Bath and North East Somerset	31 (140)	325	251	1.29	0.002
	05	Gloucestershire	76 (154)	937	722	1.30	0.001
	05	Mid Essex	72 (185)	879	720	1.22	0.001
	06	Southampton city	69 (164)	889	661	1.34	0.001
	06	North East Essex	66 (187)	855	660	1.30	0.001
	07	Torbay	32 (250)	337	251	1.34	0.001
	07	East Sussex Downs and Weald	68 (194)	549	453	1.21	0.003
	08	West Sussex	18 (64)	117	72	1.61	0.001
	08	Oxfordshire	38 (87)	201	149	1.35	0.01
	09	West Hertfordshire	21 (34)	124	74	1.68	0.001
	09	Berkshire West	30 (76)	212	148	1.43	0.001
	14	Northumberland	6 (62)	33	13	2.46	0.001

PCT, Primary Care Trust.