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Table 4 Univariable random effects negative binomial model

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

Variable IRR Standard error P-value 95% confidence interval
Year     
  2001 (Referent)    
  2002 1.02 0.05 0.71 0.92 – 1.13
  2003 1.10 0.06 0.07 0.99 – 1.22
  2004 1.23 0.07 <0.001 1.11 – 1.36
  2005 1.30 0.07 <0.001 1.17 – 1.45
  2006 0.96 0.06 0.49 0.86 – 1.08
  2007 0.91 0.05 0.11 0.81 – 1.02
Season (Referent)    
  Winter 1.07 0.04 0.08 0.99 – 1.16
  Spring 1.04 0.04 0.33 0.96 – 1.12
  Summer 0.90 0.04 0.01 0.83 – 0.98
  Fall     
Census agriculture region     
  Central Ont. (Referent)    
  Eastern Ont. 1.25 0.28 0.33 0.80 – 1.94
  Northern Ont. 0.92 0.29 0.78 0.49 – 1.69
  Southern Ont. 2.37 0.41 <0.001 1.69 – 3.33
  Western Ont. 0.96 0.18 0.81 0.67 – 1.37
Log 10 total processed per year 0.67 0.02 <0.001 0.63 – 0.70
Median quarterly
stock price
1.003 0.0006 <0.001 1.002 – 1.004
  1. Univariable random intercept negative binomial model with abattoir as a random effect, modeling the association between condemnation rates in provincial abattoirs in Ontario and year, season, census agricultural region, log10 total hogs processed per year, and median quarterly hog stock price.