Using geographic information systems and spatial and space-time scan statistics for a population-based risk analysis of the 2002 equine West Nile epidemic in six contiguous regions of Texas

Table 2 Significant spatio-temporal case-clusters in the 2002 Texas equine WNV epidemic in six contiguous Health Service Regions (See Figure 6 for cluster location).

Date (Until)	Cluster Rank	Observed cases	Expected cases	Log Likelihood Ratio	p value
Jul.31	1	19	1	59.52	0.001
	2	3	0	7.74	0.016
Aug.31	1	134	15	201.29	0.001
	2	54	5	80.45	0.001
	3	25	5	21.82	0.001
Sep.30	1	255	29	380.49	0.001
	2	95	10	133.35	0.001
	3	29	9	13.88	0.001
Oct.31	1	280	68	203.69	0.001
	2	113	24	89.85	0.001
	3	69	21	35.20	0.001
	4	96	53	14.98	0.001
	5	96	56	12.00	0.001
Dec.2	1	280	70	196.25	0.001
	2	113	25	86.98	0.001
	3	70	22	34.89	0.001
	4	104	54	18.75	0.001
	5	104	58	15.31	0.001

ISSN: 1476-072X