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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.
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Acta Veterinaria Scandinavica

ISSN: 1751-0147