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Table 8 Summary of space-time clusters* of high condemnation rates (2001–2007)

From: Exploring relationships between whole carcass condemnation abattoir data, non-disease factors and disease outbreaks in swine herds in Ontario (2001–2007)

Cluster Number of abattoirs Date range Radius (km) Number of cases Number processed CR/1000 pigs O/E Y/N
1 1 2005/8/24 - 2006/8/23 0 1 238 30 721 40.3 4.37 Y
2 1 2002/2/15 - 2002/8/29 0 494 6 328 78.07 7.63 N
3 3 2004/4/16 - 2005/4/13 21.84 1 112 116 112 9.58 2.16 Y
4 2 2002/7/11 - 2002/9/4 22.93 83 12 022 6.90 17.88 N
5 18 2006/8/30 - 2007/8/22 47.43 450 28 676 15.70 1.83 N
  1. *Clusters were detected using a spatial scan statistic run over the entire study period with the space-time permutation model and significance level alpha ≤ 0.05.
  2. **Y/N refers to positive association with widespread outbreaks of PCVAD, PRRS, and SIV in reference to laboratory reports, whereby scan results within timeframe 2004/08/01 – 2006/12/31 = positive association (Y) and all other results = no association (N).
  3. Descriptive statistics indicating total market hogs condemned, processed, corresponding condemnation rates (CR) per 1000 market hogs processed (pigs), relative risks (RR) within clusters and correspondence with known widespread outbreak timeframe (Y/N)**.