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Table 3 Results of logistic regression analysis for risk factors for high occurrence of respiratory disease in pregnant heifers and cows (100 herds)

From: Association of herd BRSV and BHV-1 seroprevalence with respiratory disease and reproductive performance in adult dairy cattle

Risk factor

Herds (n)

OR

p

95% CI

BRSV prevalence in heifersa

    

0

46

1

-

-

1-49%

40

6.2

0.010

1.6; 25.0

≥50%

14

1.3

0.769

0.2; 8.2

Herd sizeb

    

20-99 cows

40

1

-

-

100-199 cows

19

1.3

0.81

0.2; 8.2

200-399 cows

23

2.8

0.160

0.7; 11.8

> 400 cows

18

4.7

0.052

1.0; 22.8

  1. aBRSV prevalence in cows p = 0.017, the Wald test
  2. bHerd size p = 0.208, the Wald test