Table 1.
Description of the respiratory conditions assessed at abattoir and the scoring system used for each scheme.
Table 2.
Summary of outcomes of the surveillance schemes showing the number of pigs examined and the percentage of cases at animal level for each condition in the three schemes between July 2005 and December 2012.
Fig 1.
Observed annual average prevalence of respiratory conditions in each scheme.
Enzootic pneumonia (EP), pleurisy (PL), pleuropneumonia (PP), and lung abscess (Abscess).
Table 3.
Annual average prevalence of the four respiratory conditions by scheme.
Fig 2.
Smooth trend estimates obtained by fitting model 1 to each of the four respiratory conditions.
(Enzootic pneumonia-like lesions (EP), pleurisy (PL), pleuropneumonia (PP), lung abscess (Abscess)). The dotted lines are 2 standard deviations (95.4% confidence interval) from the estimated trend (solid line). The y-axis represents estimates of prevalence levels.
Fig 3.
Smooth estimates of seasonal patterns obtained by fitting model 1 to each of the four respiratory conditions.
(Enzootic pneumonia-like (EP), pleurisy (PL), pleuropneumoniae (PP), lung abscess (Abscess)). The dotted lines are two standard deviations from the estimated trend (solid line). The y-axis represents estimates of prevalence levels. The x-axis represents the seasons of the year (1 = winter, 2 = spring, 3 = summer and 4 = autumn).
Table 4.
Odds ratio and 95% confidence interval (CI) for the estimate of scheme level differences obtained from parametric terms of the semi-parametric GAM (model 1) for all the conditions between 2005 and 2012 combined.
Table 5.
Seasonal effects obtained by fitting model 2, measured by the size of the amplitude (expressed as odds i.e. exp(amp) where amp is as defined in Eq 3).
Table 6.
Summary of Random Effects of year, abattoir and nested farms in abattoirs obtained from model 2.