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. 2015 Mar 5;77(7):861–863. doi: 10.1292/jvms.15-0007

Table 2. Description of the final frailty model for the risk of seroconversion by the exposure status.

Level Coefficient Standard error of
coefficient		 Hazard ratio
(HR)		 95% confidence
interval of HR		 P
Unexposed group Reference
Exposed group 2.52 0.73 12.43 2.97, 51.98 0.001

Number of observations=132, χ2 value of likelihood ratio test=15.11 (P=0.0001).