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Table 3 Minimal models exploring factors affecting variation in M. hyopneumoniae infection status, ln-transformed no. of copies and VNTR types in pigs

From: The role of co-infections in M. hyopneumoniae outbreaks among heavy fattening pigs: a field study

Response variable Explanatory variable   Parameter estimate ± SE Statistic p-value
M. hyopneumoniae infection status Groupb A 2.67 ± 0.55 χ22 = 32.8 <0.0001
  B 1.98 ± 0.47   
  Timec T1 0.37 ± 0.33 χ21 = 0.25 0.62
  M. hyorhinis
infection statusd
Infected 0.58 ± 0.27 χ21 = 4.59 0.032
  P. multocida infection statusd Infected −0.71 ± 0.33 χ21 = 4.49 0.034
  Group:Timeb, c Group A: T1 −0.42 ± 0.61 χ22 = 4.01 0.13
   Group B: T1 −1.01 ± 0.50   
M. hyopneumoniae no. of copies (ln-transformed)*, a Groupb A 3.45 ± 0.54 F2, 425 = 19.7 <0.0001
  B 2.04 ± 0.55   
Timec T1 0.03 ± 0.59 F1, 425 = 14.7 0.0001
M. hyorhinis
infection statusd
Infected 1.11 ± 0.33 F1, 425 = 11.2 0.0009
  A. pleuropneumoniae infection statusd Infected 0.65 ± 0.40 F1, 425 = 2.70 0.10
  Group:Timeb, c Group A: T1 −1.84 ± 0.75 F2, 425 = 3.48 0.032
   Group B: T1 −1.74 ± 0.77   
M. hyopneumoniae MLVA†, a Groupb A −1.73 ± 0.51 χ22 = 1.02 0.60
  B −1.18 ± 0.49   
Timec T1 2.41 ± 0.59 χ21 = 9.20 0.0024
PRRSV
infection statusd
Infected 1.13 ± 0.56 χ21 = 4.09 0.043
  Group:Timeb, c Group A: T1 −2.54 ± 0.70 χ22 = 13.42 0.0012
   Group B: T1 −2.13 ± 0.71   
  1. In all the models, pig IDs and farm IDs were included as random intercepts.
  2. mixed logistic regression; * linear mixed model; a only positive animals; b Group C held as reference; c T0 held as reference; d not-infected held as reference.