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Table 3 Coefficients, incidence risk ratios and 95% and their confidence intervals for the final two models using the count of positive confirmed cases in the initial cull as dependent variable and the flock-susceptibility risk indicators as the main explanatory variables.

From: The impact of the genotype on the prevalence of classical scrapie at population level

Variables

Model 4 (Low susceptibility)

Model 5 (High susceptibility)

 

Coef.

IRR

95%CI

Coef.

IRR

95%CI

constant

-4.05

 

-6.2- -1.91

-4.23

 

-6.16- -2.3

Flock-susceptibility risk indicator

0.42

1.52

1.15-2

0.46

1.59

1.21-2

Country

      

Wales

1.93

6.9

0.8-60

2.2

9

1.12-72.2

Scotland

2.24

9.4

1.15-76.2

2.23

9.4

1.31-66.9

# animals (baseline: < 300)

      

300-1 000

2.37

10.7

1.34-86.2

2.34

10.4

1.52-71

> 1 000

2.95

19.1

2.53-145

3

20.2

3.13-130.4

Scotland × 300-1 000

-3.6

0.02

0-0.78

-3.6

0.02

0-0.57

Scotland × > 1 000

-4.3

0.01

0-0.2

-4.38

0.01

0-0.17

  1. Parameters in bold are significant at 0.05 level