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Table 2 Coefficients, incidence risk ratios (IRR) and their 95% confidence intervals for the final three models using the count of positive confirmed cases in the initial cull as dependent variable and the centred-log-ratio (clr) transformations of the proportions of genotypes, NSP types and alleles.

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

Variables Model 1 (Genotypes) Model 2 (NSP types) Model 3 (alleles)
  Coef. IRR 95%CI Coef. IRR 95%CI Coef. IRR 95%CI
constant 0.7   -0.5-1.9 -0.7   -2.1-0.7 -0.3   -2-1.3
clr % ARR/ARR -0.5 0.5 0.4-0.8       
clr % ARR/AHQ 0.5 1.7 1.2-2.2       
clr % AHQ/VRQ 0.2 1.2 0.99-1.5       
clr % ARH/VRQ 0.3 1.3 1.08-1.7       
clr % ARQ/VRQ 1.7 1.9 1.5-2.6       
clr % NSP V     1.2 3.4 2.2-5.2    
clr % ARH        0.8 2.3 1.2-4.4
clr % ARQ        1.3 3.7 1.2-11.6
clr % AHQ        1 2.7 1.2-5.9
clr % VRQ        1.4 4 2-8
Country          
Wales 1.7 5.8 2.3-14.9 1.6 5 2.1-12.1 1.5 4.4 1.8-10.9
Scotland -1.1 0.3 0.08-1.4 0.8 2.3 0.3-17.8 1.2 3.4 0.6-20.8
# flocks (baseline: 1)          
2 0.9 2.6 0.9-7.7 0.7 2 0.8-5.4 0.7 2 0.7-5.4
3 0.7 2 0.6-6.4 0.6 1.8 0.6-5.5 0.5 1.7 0.5-5.3
4 or more 1.7 5.4 1.9-15.6 1.4 3.9 1.4-10.7 1.3 3.8 1.3-11.3
# animals (baseline: < 300)          
300-1000        1.5 4.3 1.2-16.1
> 1000        1.5 4.7 1.3-16.7
Wales × 2 flocks -1.9 0.1 0.04-0.5 -1.5 0.2 0.07-0.7 -1.3 0.2 0.08-0.8
  1. Parameters in bold are significant at 0.05 level