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Table 2 Final multivariable model* of the associations between use of vaccines and consumption of antimicrobials with gastro-intestinal indications (AC-GI) in 1415 Danish sow herds after controlling for production size, 2013. Group 0 (no vaccination) and small herd size were used as reference classes

From: Comparison of the antimicrobial consumption in weaning pigs in Danish sow herds with different vaccine purchase patterns during 2013

Variables and classes AC-GI (ADD/100 weaners/day) Converted AC-GI (ADD/100 weaners/day)
Estimate of square root-transformed outcome Standard error P-value Mean estimate Lower 95 % CI Upper 95 % CI
Intercept 2.384 0.076 <0.0001 5.7 5.0 6.4
Combinations of vaccines    0.2    
 Group 0: PCV2 = 0 & MYC = 0 & LAW = 0 (n = 351) 0.000 n.a.   5.7 n.a. n.a.
 Group 1: PCV2 = 1 & MYC = 0 & LAW = 0 (n = 277) 0.145 0.097   6.4 5.5 7.4
 Group 2: PCV2 = 0 & MYC = 1 & LAW = 0 (n = 204) −0.004 0.106   5.7 4.7 6.7
 Group 3: PCV2 = 0 & MYC = 0 & LAW = 1 (n = 21) 0.021 0.270   5.8 3.5 8.6
 Group 4: PCV2 = 1 & MYC = 1 & LAW = 0 (n = 476) 0.183 0.085   6.6 5.8 7.5
 Group 5: PCV2 = 1 & MYC = 0 & LAW = 1 (n = 32) 0.258 0.222   7.0 4.9 9.5
 Group 6: PCV2 = 0 & MYC = 1 & LAW = 1 (n = 9) 0.058 0.405   6.0 2.7 10.5
 Group 7: PCV2 = 1 & MYC = 1 & LAW = 1 (n = 45) −0.026 0.190   5.6 3.9 7.5
Herd size (number of weaners pen places)    0.02    
 Small (n = 468)a 0.000 n.a.   5.7 n.a. n.a.
 Medium (n = 585)a,b 0.151 0.075   6.4 5.7 7.2
 Large (n = 362)b 0.227 0.085   6.8 6.0 7.7
  1. n.a. not applicable, PCV2 Porcine Circovirus Type 2, MYC Mycoplasma hyopneumoniae, LAW Lawsonia intracellularis
  2. a, b – different letters indicate variable classes with significantly different parameter estimates of antimicrobial consumption according to an F-test
  3. *Model statistics: R 2 = 0.006, F = 2.0, P = 0.03