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Table 2 Results of the space-time scan statistic using pneumonic lung condemnation data

From: Comparison of covariate adjustment methods using space-time scan statistics for food animal syndromic surveillance

Date of cluster No. of abattoirs in cluster Latitude (°N) Longitude (°W) Radius (Km) No. of cases Relative risk1 P-value
a) Unadjusted Poisson space-time scan test
Jan 2001 - Jun 2004 5 43.94 79.69 26.60 14896 4.98 < 0.001
Jun 2004 - Nov 2007 63 49.75 92.96 1149.60 54 0.01 < 0.001
b) Animal-adjusted Poisson space-time scan test
Jan 2001 - Jun 2004 5 43.96 79.69 26.60 14896 3.12 < 0.001
Mar 2004 - Aug 2007 21 43.01 79.97 49.09 61 0.01 < 0.001
Oct 2001 - Mar 2005 1 42.98 80.60 0 4466 5.14 < 0.001
c) Model-adjusted space-time scan test
Mar 2004 - Aug 2007 16 43.01 79.97 36.88 60 0.07 < 0.001
Jan 2001 - Mar 2003 1 43.91 79.82 0 1558 0.44 < 0.001
Jan 2001- Mar 2002 4 43.30 79.90 19.98 477 6.06 < 0.001
Apr 2005 - Nov 2007 4 43.96 79.19 20.93 273 0.26 < 0.001
d) Space-time permutation scan test
Jan 2001 - Feb 2003 11 44.14 79.94 28.20 1520 0.31 < 0.001
Jan 2001 - Feb 2003 32 42.95 79.10 121.36 10514 1.55 < 0.001
Feb 2005 - Dec 2007 10 43.96 79.19 38.19 363 0.20 < 0.001
e) Space-time scan test of residuals
Jan 2001 - Mar 2003 1 43.91 79.82 0 110 --- < 0.001
Jan 2001 – Feb 2003 8 43.17 79.73 26.91 370 --- < 0.001
Jul 2003 - Jun 2004 6 43.65 79.86 29.33 109 --- < 0.001
Jan 2001 - Mar 2003 36 43.99 80.67 68.49 2280 --- < 0.001
  1. 1The values in this column for the space-time permutation model refer to the observed/expected value.