Skip to main content

Table 2 Univariate and multivariable analysis of average within herd prevalence (%) of pluck lesions and lung surface affected with pneumonia depending on farm serology for influenza A virus (IAV), porcine respiratory and reproductive syndrome virus (PRRSv) and Mycoplasma hyopneumoniae (Mhyo)a,b

From: A cross-sectional survey on respiratory disease in a cohort of Irish pig farms

 

IAV

PRRSv

Mhyo

Dorsocaudal Pleurisy

Pos: 9.8 (0.9, 51.8)

Neg: 2.4 (0.4, 47.7)

Pos: 10.2 (2.8, 51.8)

Neg: 4.0 (0.4, 49.5)

Pos: 8.2 (2.0, 51.8)

Neg: 2.9 (0.4, 47.7)

 Univariate

P < 0.001

P = 0.008

P = 0.009

 Multivariable

P < 0.001

-

-

Mod Sev dorsocaudal pleurisy

Pos: 7.5 (0.7, 46.9)

Neg: 1.7 (0.0, 42.6)

Pos: 8.7 (1.8, 46.9)

Neg: 3.8 (0.0, 42.6)

Pos: 6.8 (0.5, 46.9)

Neg: 2.6 (0.0, 42.6)

 Univariate

P < 0.001

P = 0.006

P = 0.025

 Multivariable

P < 0.001

-

-

Cranial pleurisy

Pos: 12.4 (1.9, 54.2)

Neg: 4.8 (1.2, 35.1)

Pos: 12.4 (4.2, 54.2)

Neg: 7.1 (1.2, 51.6)

Pos: 10.9 (2.5, 54.2)

Neg: 5.8 (1.2, 35.1)

 Univariate

P = 0.001

P = 0.007

P = 0.032

 Multivariable

P < 0.001

-

-

Pneumonia

Pos: 9.5 (0.7, 50.0)

Neg: 1.5 (0.0, 18.9)

Pos: 10.3 (1.3, 34.7)

Neg: 2.6 (0.0, 50.0)

Pos: 11.0 (2.0, 50.0)

Neg: 1.3 (0.0, 30.7)

 Univariate

P = 0.003

P = 0.035

P < 0.001

 Multivariable

P = 0.023

-

P < 0.001

Avg pneumonia surface c

Pos: 6.0 (1.0, 13.5)

Neg: 2.7 (0.0, 9.5)

Pos: 6.4 (2.2, 13.5)

Neg: 4.6 (0.0, 10.6)

Pos: 6.5 (2.0, 13.5)

Neg: 2.3 (0.0, 6.6)

 Univariate

P = 0.002

P = 0.014

P < 0.001

 Multivariable

-

-

P < 0.001

Scars

Pos: 12.5 (1.9, 39.3)

Neg: 2.3 (0.0, 23.1)

Pos: 17.5 (1.4, 39.3)

Neg: 8.0 (0.0, 24.3)

Pos: 15.9 (3.1, 39.3)

Neg: 2.5 (0.0, 13.2)

 Univariate

P < 0.001

P < 0.001

P < 0.001

 Multivariable

P = 0.008

-

P < 0.001

Abscesses

Pos: 0.5 (0.0, 11.1)

Neg: 0.1 (0.0, 21.5)

Pos: 0.3 (0.0, 4.3)

Neg: 0.3 (0.0, 21.5)

Pos: 0.5 (0.0, 11.1)

Neg: 0.2 (0.0, 21.5)

 Univariate

P = 0.073

P = 0.842

P = 0.194

 Multivariable

P = 0.061

-

-

Pericarditis

Pos: 8.0 (1.2, 19.1)

Neg: 6.1 (1.5, 14.8)

Pos: 8.0 (2.3, 16.4)

Neg: 7.4 (1.2, 19.1)

Pos.: 8.2 (1.5, 19.1)

Neg.: 5.5 (1.2, 15.6)

 Univariate

P = 0.251

P = 0.561

P = 0.018

 Multivariable

-

-

P = 0.024

Liver milk spots

Pos: 27.1 (0.5, 97.3)

Neg: 12.4 (0.4, 88.8)

Pos: 24.4 (0.5, 87.9)

Neg: 17.8 (0.4, 97.3)

Pos.: 15.7 (0.4, 88.8)

Neg.: 25.3 (0.4, 97.3)

 Univariate

P = 0.374

P = 0.838

P = 0.899

 Multivariable

-

-

-

  1. aUnivariate analysis was carried using Mann-Whitney test and data is presented as median (range) for positive (pos) and negative (neg) farms. Multivariable analysis was carried out using generalized linear models with forward selection with a P for inclusion of 0.10 and a P for retention of 0.05
  2. bResults for APP are not presented as there was only one farm negative to it
  3. cAverage lung surface affected with pneumonia (%)
Back to article page

Irish Veterinary Journal

ISSN: 2046-0481