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Table 6 Multivariable poisson regression models identifying risk factors and their influence on the incidence rate ratio

From: Individual risk factors for Mycoplasma hyopneumoniae infections in suckling pigs at the age of weaning

Variable IRR P-value 95% CI
Second iron injection in suckling pigs    
  No 1.00 - -
  Yes 0.08 0.08 0.01-1.33
  Herd 1 vs. herd 2 5.89 0.22 0.34-101
  Herd 1 vs. herd 3 0.67 0.69 0.09-4.94
Teeth grinding    
  No 1.00 - -
  Yes 0.10 <0.01 0.02-0.44
  Herd 1 vs. herd 2 4.76 0.04 1.08-20.9
  Herd 1 vs. herd 3 n.a.   
Vaccination of suckling pigs against PCV2    
  No 1.00 - -
  Yes 9.72 <0.01 2.30-41.0
  Herd 1 vs. herd 2 0.49 0.03 0.25-0.94
  Herd 1 vs. herd 3 n.a.   
Second routine treatment of suckling pigs    
  No 1.00 - -
  Yes 0.08 0.08 0.01-1.33
  Herd 1 vs. herd 2 5.89 0.22 0.34-101
  Herd 1 vs. herd 3 0.67 0.69 0.09-4.94
Number of piglets cross-fostered into a litter    
  1. & 3. Quartile 1.00 - -
  4. Quartile 1.82 0.08 0.94-3.52
  Herd 1 vs. herd 2 0.52 0.05 0.27-1.00
  Herd 1 vs. herd 3 0.10 <0.01 0.02-0.41
Temperature in the piglet nest / day of birth    
  1. Quartile (26.5°C-32.2°C) 1.00 - -
  2. Quartile (32.3°C-33.5°C) 0.55 0.17 0.24-1.29
  3. Quartile (33.6°C-36.6°C) 0.62 0.27 0.27-1.43
  4. Quartile (36.7°C-47.1°C) 0.40 0.04 0.16-0.96
  Herd 1 vs. herd 2 0.45 0.02 0.23-0.89
  Herd 1 vs. herd 3 0.09 <0.01 0.02-0.37
Temperature in the piglet nest / 7 day post natum    
  1. Quartile (22.4°C-32.2°C) 1.00 - -
  2. Quartile (32.3°C-33.8°C) 0.47 0.13 0.17-1.25
  3. Quartile (33.9°C-35.1°C) 0.23 <0.01 0.08-0.63
  4. Quartile (35.2°C-42.2°C) 0.34 0.01 0.14-0.81
  Herd 1 vs. herd 2 0.71 0.39 0.33-1.53
  Herd 1 vs. herd 3 0.11 <0.01 0.03-0.46
Temperature in the piglet nest / 14 day post natum    
  1. Quartile (23.6°C-30.9°C) 1.00 - -
  2. Quartile (31.0°C-32.7°C) 1.25 0.54 0.62-2.52
  3. Quartile (32.8°C-33.9°C) 0.42 0.10 0.16-1.16
  4. Quartile (34.0°C-43.2°C) 0.26 0.02 0.09-0.77
  Herd 1 vs. herd 2 0.48 0.03 0.25-0.94
  Herd 1 vs. herd 3 0.10 <0.01 0.02-0.42
  1. Using PCR results from suckling pigs’ nasal swabs as a binomial outcome variable, the incidence rate ratio (IRR) were calculated. Significant differences between levels are indicated in bold.
  2. IRR with P-value ≤0.05 are marked in bold.