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Table 2 Multivariable logistic regression of farm-based factors associated with serological Q fever infection on farm level

From: Seroprevalence and risk factors of Q fever in goats on commercial dairy goat farms in the Netherlands, 2009-2010

Variable Category N (%) Prev (%) aOR 95% CI
Distance to the nearest bulk milk PCR-positive farm (km) < 8 48 50.0 66.7 12.9 3.0-54.8
  ≥ 8 48 50.0 20.8 Ref  
Cattle density per km2 in farm municipality (excl. meat calves) ≥ 100 67 69.8 50.8 14.4 2.7-78.4
  < 100 29 30.2 27.6 Ref  
Herd size (number of goats according to UBN registry) ≥ 800 47 49.0 59.6 2.8 0.8-9.4
  < 800 49 51.0 28.6 Ref  
Control nuisance animals (e.g. wild birds) in 2008 Yes, by covering air spaces 15 84.4 73.3 48.8 4.0-591.2
  By other ways or not applicable 81 15.6 38.3 Ref  
Dogs(s) in goat stable Yes 60 62.5 51.7 3.8 1.0-14.2
  No/unknown 36 37.5 30.6 Ref  
Cat(s) in goat stable Yes 34 35.4 58.8 6.3 1.5-25.8
  No/unknown 62 64.6 35.5 Ref  
Origin of Straw Abroad/unknown 59 61.5 49.2 5.0 1.3-19.6
  No straw or domestic straw 37 38.5 35.1 Ref  
Signs of vermin (mice, rats, birds) in roughage or litter during past 12 months Unknown 14 14.6 64.3 4.3 0.8-22.3
  Known (yes or no) 82 85.4 40.2 Ref  
  1. Factors associated with Q fever on farm level with their frequency (N), prevalence (Prev), adjusted odds ratio (aOR) with corresponding 95% confidence interval (95% CI) in the final multivariable logistic model (96 farms; 43.1% positive farms based on total sample of 123 farms and 2,828 goats)