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Table 4 Factors associated BoHV1 status of stock bulls, using logistic regression analysis. Independent variables including age of individual bulls, movements pre-sampling, herd of origin, and vasectomy

From: Prevalence of BoHV-1 seropositive and BVD virus positive bulls on Irish dairy farms and associations between bull purchase and herd status

Dependent variable Independent variable Odds ratio Confidence interval (95 %) P value
BoHV-1 classification Age of the bulls    
POSITIVE vs. NEGATIVE 2 years vs. 1 year 5.15 1.89 14.03 0.001
3 years vs. 1 year 12.78 4.46 36.61 0
4 years or older vs. 1 year 28.94 9.35 89.5 0
Movement pre-sampling vs. no movement 1.32 1.04 1.67 0.019
Purchased vs. Homebred 3.08 1.51 6.29 0.002
Non vasectomized vs. vasectomizeda 3.16 0.89 11.20 0.074
  1. aIncluded for the purposes of highlighting a trend