Spatial epidemiology of porcine reproductive and respiratory syndrome in Thailand

BMC Veterinary Research

Table 1 Details of the spatial clusters of PRRS in Thailand in 2010

Cluster (period*)	Location	Area (km2)	Log likelihood ratio	P-value (999)	Relative risk	Prevalence
1 (2^nd)	The South-East of region 3	91.36	30.93	0.001	8.73	0.068
2 (1^st, 2^nd)	The West of region 2	39.86	20.47	0.001	16.59/8.07	0.061/0.082
3 (1^st, 2^nd)	The South-East of region 8	49.48	19.39	0.001	24.68/1.65	0.081/0.018
4 (1^st, 2^nd)	The South-West of region 4	43.09	17.22	0.001	15.04/6.32	0.056/0.064
5 (2^nd)	The North-East of region 6	42.95	16.73	0.004	13.41	0.13
6 (1^st)	The North of region 4	26.98	14.42	0.012	47.12	0.18

*The 1^st period was during January to July 2010 and the 2^nd period was during August to December 2010.
Characteristics of the six spatial clusters of PRRS in Thailand in 2010 identified using the spatial scan statistic with multivariate scan test (January to July 2010 and August to December 2010), cluster size of a maximum of 20% of observations, 999 iterations, and Bernoulli model.

ISSN: 1746-6148