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Table 1 Schmallenberg virus seroprevalence in relation to different characteristics of the wild ruminants and their origin in the univariable analysis

From: Cross-sectional study of Schmallenberg virus seroprevalence in wild ruminants in Poland at the end of the vector season of 2013

Variable Category (values) SBV seroprevalence χ2 P 4 OR 5 OR 95% CI
n/N 1 % 2 95% CI 3
Animal species Fallow deer (Dama dama) 81/256 22.7 17.5-27.8 49.4 <0.001 0.8 0.7-1.0
  Red deer (Cervus elaphus) 44/176 30.6 23.7-37.5     
  Mouflon (Ovis aries musimon) 1/71 1.4 −1.4-4.3     
  Roe deer (Capreolus capreolus) 10/66 22.6 12.2-33.0     
  European bison (Bison bonasus) 9/11 81.8 54.6-109.0     
Population type Free-living 63/289 22.1 17.2-26.9 3.1 0.08 1.4 1.0-2.0
  Captive 82/291 69.1 63.7-74.4     
Gender (n = 440) Female 63/307 31.7 26.4-36.9 0.02 0.9 1.0 0.6-1.7
  Male 28/133 14.8 47.3-64.0     
Age group Below and equal to one year of age 1/41 1.7 −2.5-59.3 12.0 0.001 14.6 2.0-107.0
  Over 1 year of age 144/539 28.6 24.8-32.4     
Body weight group (n = 345) 1 (mean 15.9; range 8–25) 10/72 19.8 10.4-29.3 32.9 <0.001 2.1 1.5-2.9
  2 (mean 40.2; range 30–50) 6/116 3.3 0.008-6.6     
  3 (mean 76.7; range 55–100) 30/126 26.1 18.3-33.8     
  4 (mean 188.6; range 110–650) 14/31 42.4 23.9-60.8     
Percent of the forest area in district Low (mean 25.8; range 20.1-30.9) 10/61 17.4 7.6-27.2 8.8 0.01 1.8 1.2-2.8
  Medium (mean 40.8; range 35.2-66.0) 110/454 25.0 21.0-29.0     
  High (mean 85.9; range 67.5-97.3) 25/65 36.0 24.0-48.0     
District-level density of wild ruminants (animals per km2) Low (mean 2.8; range 2.1-3.4) 3/13 17.4 −6.4-41.2 23.8 <0.001 0.4 0.3-0.66
  Medium (mean 5.5; range 4.1-6.3) 94/275 31.3 25.8-36.9     
  High (mean 8.3; range 6.7-8.7) 48/292 15.7 11.5-19.9     
Part of country Western 72/434 22.8 18.9-26.8 65.0 <0.001 5.0 3.3-7.6
  Eastern 73/146 36.6 28.7-44.5     
Province-level density of domestic ruminants Low (mean 5.5; range 4.2-14.0) 64/390 20.0 16.1-24.1 48.2 <0.001 2.7 2.0-3.6
  Medium (mean 21.1; range 17.7-28.5) 62/152 34.1 26.5-41.7     
  High (mean 44.4; range 44.4-44.4) 19/38 42.0 25.6-58.4     
  1. 1number of SBV seropositive samples / number of tested samples; 2seroprevalence adjusted for forest district population weights; 3confidence interval calculated by Wald test; 4p < 0.05 was considered significant; 5odds ratio.