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Table 1 Akaike information criterion (AIC) and the parsimony principle were used to select the best model for each outcome

From: Adverse effects of Influenza A(H1N1)pdm09 virus infection on growth performance of Norwegian pigs - a longitudinal study at a boar testing station

Outcome Predictors (fixed effects) Random effects AIC ΔAIC
Infection status group (INFGP) Breed (Br) Growth Phase (GF) Birthdate Ave daily feed intake (ADFI) Interaction term INFGP*GF Interaction term INFGP*Br Pig Herd
ADG x x x x x x x x x -7157.8 -1.7
  x x x x x x x   x -7132.5 23.6
  x x x x x x x x   -7147.8 8.3
x x x x x x   x x -7156.1 0
  x x x x x   x x x -7150 6.1
  x x x x x    x x -7149 7.1
FCE x x x x x x x x x -1889 3.7
  x x x x x x x   x -1769 123.7
  x x x x x x x x   -1878 14.7
x x x x x x   x x -1892.7 0
  x x x x x   x x x -1864 28.7
  x x x x x    x x -1867 25.7
ADFI x x x x x x x x x 3299.8 2.8
  x x x x x x x   x 3564 267
  x x x x x x x x   3307 10
x x x x x x   x x 3297 0
  x x x x x   x x x 3304 7
  x x x x x    x x 3302 5
Age 100 kg x x   x x   x   x 13111 5
  x x   x x   x    13205.5 99.5
x x   x x     x 13106 0
OFI x x   x x   x   x 15281 3
  x x   x x   x    15362 84
x x   x x     x 15278 0
  1. Abbreviations: ADG average daily growth in kg/day, FCE feed conversion efficiency in kg feed/kg weight gain, ADFI average daily feed intake in kg/day, Age 100 kg age of pig when they reached 100 kg, OFI overall feed intake in kg from 33 kg to 100 kg bodyweight.
  2. Selected model is indicated by (→). Marking X indicates predictor was included in the model. ΔAIC = difference in AIC between the tested models and the selected model given in bold.