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Table 2 Unconditional associations between categorical independent variables and infection status of 41 study herds in Ireland during November 2007

From: Herd and within-herd BoHV-1 prevalence among Irish beef herds submitting bulls for entry to a performance testing station

  Herd infection status
Variable Total (%)
(n = 41
herds)
Non-infected (%)
(n = 11
herds)
Infected (%)
(n = 30
herds)
P-value
Herd size
1) 4-32 animals 27 18 30  
2) 33-55 animals 24 45 17  
3) 56-88 animals 24 27 23 0.2256
4) 89-320 animals 24 9 30  
Number of farm-bought cattle during 2007
1) 0 animals 37 45 33  
2) 1-2 animals 22 18 23  
3) 3-5 animals 22 9 27 0.6000
4) 6-22 animals 20 27 17  
Closed herd '07
Yes 20 27 17  
No 80 73 83 0.6582
Percentage purebred
1) 0-50% 37 27 40  
2) 51-90% 29 27 30 0.6795
3) 91-100% 34 45 30  
Average herd age
1) 1.77-3.01 years 27 27 27  
2) 3.02-3.40 years 24 18 27  
3) 3.41-3.75 years 24 45 17 0.2612
4) 3.76-4.98 years 24 9 30  
Percentage homebred
1) 15-79% 63 45 70 0.2720
2) 80-100% 37 55 30