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Table 1 Reproductive performance data prior to and after implementation of vaccination

From: Reproductive performance of pandemic influenza A virus infected sow herds before and after implementation of a vaccine against the influenza A (H1N1)pdm09 virus

 before vaccinationafter vaccination alteration in the farms
parametermeanmedianmeanmedianp-valueadecrease (%)stagnation (%)increase (%) 
(n = number of farms)(SD)(Q25; Q75)(SD)(Q25; Q75) (n)(n)(n)p-valueb
return to oestrus rate (%)13.5212a10.189.9a< 0.00174.85.319.8 
(n = 131)(6.65)(8.8; 18)(4.61)(7; 12) (98)(7)(26)< 0.001
abortion rate (%)2.311.45a1.421a< 0.0015721.521.5 
(n = 93)(2.52)(0.8; 3.0)(1.67)(0.4; 2.1) (53)(20)(20)< 0.001
stillbirth rate (%)7.797.8a7.958.2a> 0.05408.052 
(n = 50)(3.75)(5.3; 9.8)(3.44)(6.8; 9.9) (20)(4)(26)0.376
piglets born alive/litter (n)13.24a13.213.56a13.50.00125.93.770.4 
(n = 54)(1.12)(12.5; 13.6)(1.17)(12.8; 14.2) (14)(2)(38)0.001
preweaning mortality (%)14.3414.7a13.5913.7a0.02349.61634.4 
(n = 125)(3.5)(12.5; 16)(4.0)(11.6; 16) (62)(20)(43)0.08
piglets weaned/sow/year (n)26.06a26.227.39a27.2< 0.00118.14.877.1 
(n = 105)(3.03)(23.8; 28.5)(3.15)(25.5; 29.9) (19)(5)(81)< 0.001
  1. acomparison of the parameters before and after immunisation, t-test or Wilcoxon signed-rank test, respectively
  2. bstagnation was not included in the chi-squared test