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Table 3 Final multivariable model* of the associations between use of vaccines and consumption of antimicrobials with respiratory indications (AC-RESP) in 836 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-RESP (ADD/100 weaners/day) Converted AC-RESP (ADD/100 weaners/day)
Estimate of log-transformed outcome Standard error P-value Mean estimate Lower 95 % CI Upper 95 % CI
Intercept 0.497 0.145 <0.0001 1.6 1.2 2.2
Combinations of vaccines    <0.0001    
 Group 0: PCV2 = 0 & MYC = 0 & LAW = 0 (n = 155)a,c 0.000 n.a.   1.6 n.a. n.a.
 Group 1: PCV2 = 1 & MYC = 0 & LAW = 0 (n = 136)a 0.404 0.177   2.5 1.7 3.5
 Group 2: PCV2 = 0 & MYC = 1 & LAW = 0 (n = 134)b 0.648 0.177   3.1 2.2 4.4
 Group 3: PCV2 = 0 & MYC = 0 & LAW = 1 (n = 10)a,c 0.160 0.490   1.9 0.7 5.0
 Group 4: PCV2 = 1 & MYC = 1 & LAW = 0 (n = 349)b 0.672 0.146   3.2 2.4 4.3
 Group 5: PCV2 = 1 & MYC = 0 & LAW = 1 (n = 13)c −0.994 0.434   0.6 0.3 1.4
 Group 6: PCV2 = 0 & MYC = 1 & LAW = 1 (n = 6)a,b,c −0.166 0.626   1.4 0.4 4.7
 Group 7: PCV2 = 1 & MYC = 1 & LAW = 1 (n = 33)a,b,c 0.220 0.289   2.0 1.2 3.6
Herd size (number of weaners pen places)    0.06    
 Small (n = 235) 0.000 n.a.   1.6 n.a. n.a.
 Medium (n = 331) −0.261 0.129   1.3 1.0 1.6
 Large (n = 270) −0.295 0.136   1.2 0.9 1.6
  1. n.a. not applicable, PCV2 Porcine Circovirus Type 2, MYC Mycoplasma hyopneumoniae, LAW Lawsonia intracellularis
  2. a, b, c – different letters indicate variable classes with significantly different parameter estimates of antimicrobial consumption according to an F-test
  3. *Model statistics: R 2 = 0.04, F = 4.8, P = 0.001