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Table 6 Multilevel regression of pig’s age at 100 kg if they are 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

Age of pig at 100 kg
Predictors Coefficients SE P values 95% CI
Breed      
Landrace Reference     
Duroc 7.3 0.83 <0.001 5.7 9.0
Birthdate −0.006 0.0005 <0.001 −0.007 −0.005
Average daily feed intake −28.5 0.94 <0.001 −30.3 −26.6
Infection status group      
SERONEG Reference     
SEROPOS −0.4 0.34 0.292 −1.0 0.3
VIR1 1.6 0.67 0.017 0.3 2.9
VIR2 1.8 1.20 0.129 −0.5 4.2
VIR3 2.4 1.15 0.038 0.1 4.6
Constant (β 0 ) 316.8 9.4 <0.001 298.3 335.3
  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 two levels; pig (n = 1955) and herd (n = 43).