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Table 3 Prevalences (%) and univariable analysis of the potential risk factors for seropositivity to Brucella antibodies in indigenous cattle (following adjustment for sampling weight)

From: Cattle brucellosis in traditional livestock husbandry practice in Southern and Eastern Ethiopia, and its zoonotic implication

Variable Level No. of Sample Prevalence
(95% CI)
OR (95% CI) P-value*
Age groups 1 - 2 years 497 1.0 (0.1, 1.8) 1.0 (-)  
  3-4 years 366 3.0 (1.0, 5.0) 3.1 (1.0, 9.3) 0.046
  > 4 years 760 5.1 (3.4, 7.0) 5.4 (2.1, 14.1) 0.001
Sex Male 485 2.2 (0.7, 3.3) 1.0 (-)  
  Female 1138 4.1 (2.8, 5.4) 2.1 (1.0, 4.3) 0.040
Herd size < 15 animals 414 0.5 (0.2, 1.2) 1.0 (-)  
  15 - 29 animals 758 3.9 (2.1, 5.6) 8.1 (1.9, 34.7) 0.005
  ≥ 30 animals 451 4.3 (2.5, 6.1) 9.1 (2.2, 38.3) 0.003
Agro-climate Low altitude 435 4.4 (1.8, 7.0) 1.0 (-)  
  Mid altitude 1008 3.3 (2.2, 4.4) 0.7 (0.4, 1.5) 0.391
  High altitude 180 1.0 (0.3, 2.4) 0.2 (0.1, 9.5) 0.043
Production system Mixed farming 900 1.8 (0.8, 2.8) 1.0 (-)  
  Pastoral system 723 4.5 (2.9, 6.1) 2.6 (1.3, 5.1) 0.007
Species composition Cattle-small rum 1080 2.4 (1.1, 3.6) 1.0 (-)  
  Cattle-small rum-camel 271 4.7 (2.9, 6.5) 2.0 (1.0, 4.0) 0.041
  Camel-cattle-small rum 272 5.8 (2.2, 9.5) 2.6 (1.1, 6.1) 0.032
  1. * Variables with p ≤ 0.25 identified as possible risk factors and offered to multivariable model, rum: ruminant