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 (2nd) |
The South-East of region 3 |
91.36 |
30.93 |
0.001 |
8.73 |
0.068 |
| 2 (1st, 2nd) |
The West of region 2 |
39.86 |
20.47 |
0.001 |
16.59/8.07 |
0.061/0.082 |
| 3 (1st, 2nd) |
The South-East of region 8 |
49.48 |
19.39 |
0.001 |
24.68/1.65 |
0.081/0.018 |
| 4 (1st, 2nd) |
The South-West of region 4 |
43.09 |
17.22 |
0.001 |
15.04/6.32 |
0.056/0.064 |
| 5 (2nd) |
The North-East of region 6 |
42.95 |
16.73 |
0.004 |
13.41 |
0.13 |
| 6 (1st) | The North of region 4 | 26.98 | 14.42 | 0.012 | 47.12 | 0.18 |
*The 1st period was during January to July 2010 and the 2nd 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.