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Table 2 Multilevel regression of average daily growth in pigs infected with influenza A(H1N1)pdm09 virus

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

Average Daily Growth (ADG)
Predictors Coefficients SE P values 95% CI
Breed  
Landrace Reference     
Duroc −0.028 0.006 <0.001 −0.039 −0.016
Growth phase  
GF1 (33_60 kg) Reference     
GF2 (61_80 kg) −0.062 0.0071 <0.001 −0.08 −0.05
GF3 (81_100 kg) −0.134 0.0083 <0.001 −0.15 −0.12
Birthdate 0.00006 0.000006 <0.001 0.00005 0.00007
Average daily feed intake 0.31 0.0053 <0.001 0.30 0.32
Interaction term: INFGP*GF  
SERONEG*GF(1–3) Reference     
SEROPOS*GF1 0.006 0.0064 0.37 −0.01 0.02
SEROPOS*GF2 −0.004 0.0064 0.54 −0.02 0.01
SEROPOS*GF3 −0.015 0.0064 0.02 −0.03 0.00
VIR1*GF1 0.008 0.0127 0.51 −0.02 0.03
VIR1*GF2 −0.033 0.0127 0.01 −0.06 −0.01
VIR1*GF3 −0.058 0.0127 <0.001 −0.08 −0.03
VIR2*GF1 0.002 0.0230 0.94 −0.04 0.05
VIR2*GF2 −0.053 0.0230 0.02 −0.10 −0.01
VIR2*GF3 −0.015 0.0230 0.51 −0.06 0.03
VIR3*GF1 0.014 0.0221 0.52 −0.03 0.06
VIR3*GF2 −0.020 0.0221 0.37 −0.06 0.02
VIR3*GF3 −0.045 0.0221 0.04 −0.09 0.00
Constant (β 0 ) −0.746 0.1113 <0.001 −0.96 −0.53
  1. Abbreviations: SERONEG Seronegative pigs; SEROPOS Seropositive pigs (not tested for virus), VIR1 pigs viral positive between bodyweight 33 kg and 60 kg, VIR2 pigs viral positive between bodyweight 61 kg and 80 kg, VIR3 pigs viral positive between bodyweight 81 kg and 100 kg.
  2. The model is hierarchical with three levels; observations (n = 5865); pig (n = 1955) and herd (n = 43). *denotes interaction term.
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