Skip to main content

Table 3 Predictors for Mycobacterium avium subsp. paratuberculosis environmental sample culture results ( n= 139)

From: Calves shedding Mycobacterium avium subspecies paratuberculosis are common on infected dairy farms

  n (% pos) 1 Odds/OR 95% CI P -value
Intercept   0.01 0.00 – 0.16 <0.01
Age group     0.39
<3 months 31 (3) Reference   
3 – 6 months 39 (13) 4.67 0.46 – 47.65 0.19
6 months – 1 year 25 (24) 10.52 1.01 - 116.87 0.05
1 – 2 years 38 (18) 7.56 0.74 – 76.91 0.09
>2 years 6 (17) 9.57 0.38 – 240.56 0.17
IS900 within-pen prevalence2     0.92
0 75 (12) Reference   
0.01 – 0.19 42 (17) 0.94 0.27 – 3.26 0.93
>0.2 22 (18) 1.32 0.25 – 6.93 0.74
Random effects   Var. (SE)   % Var.
Herd   0.70 (0.89)   17
Pen   -   83
  1. Descriptive statistics and final multilevel logistic regression model.
  2. 1Sample size (% culture-positive samples).
  3. 2Parameter included in the model because of evidence for an association in the descriptive statistics and biological plausibility.