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Table 4 Negative binomial regression models comparing monthly pneumonic lung condemnation rates for all abattoirs for each animal class with three methods of sentinel abattoir selection

From: Suitability of sentinel abattoirs for syndromic surveillance using provincially inspected bovine abattoir condemnation data

Sentinel selection method IRR 95% CI P-value
a) Calves
Full dataset1 --- --- ---
Abattoirs open all weeks2 1.12 0.95 – 1.32 0.16
Multi-criteria3 0.90 0.76 – 1.06 0.21
Large abattoirs4 1.25 1.06 – 1.47 0.01
b) Cows
Full dataset1 --- --- ---
Abattoirs open all weeks2 2.08 1.49 – 2.91 <0.01
Multi-criteria3 2.06 1.47 – 2.89 <0.01
Large abattoirs4 3.83 2.73 – 5.38 <0.01
c) Heifers
Full dataset1 --- --- ---
Abattoirs open all weeks2 1.61 1.35 – 1.94 <0.01
Multi-criteria3 1.70 1.42 – 2.04 <0.01
Large abattoirs4 2.86 2.38 – 3.43 <0.01
d) Steers
Full dataset1 --- --- ---
Abattoirs open all weeks2 1.39 1.20 – 1.61 <0.01
Multi-criteria3 1.48 1.28 – 1.72 <0.01
Large abattoirs4 2.02 1.74 – 2.34 <0.01
  1. 1Abattoirs processing at least 1 bovine carcass each year of study period (2001 – 2007).
  2. 2Abattoirs processing at least 1 bovine carcass 52 weeks per year.
  3. 3Selection of abattoirs meeting the following criteria: processed at least 499 cattle per year, processed at least 1 bovine carcass 44 weeks or more per year, processed cattle representing all animal classes (calves, cows, heifers and steers).
  4. 4Abattoirs processing ≥ 6500 cattle per year.