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Table 2 Cox proportional hazard models for the exposure groups by birth cohort, with the naturally exposed VLA scrapie flock birth cohorts as the baseline categories.

From: The evaluation of exposure risks for natural transmission of scrapie within an infected flock

Exposure group Hazard Ratio 95% C.I. P-value
Model 1
2003 birth cohort Baseline   
2 0.98 0.30 - 3.22 0.969
3 2.70 0.92 - 7.95 0.071
4 1.04 0.40 - 2.66 0.942
8 0.03 0.005 - 0.17 < 0.001
9 0.09 0.02 - 0.34 < 0.001
11 0.60 0.23 - 1.52 0.279
12 1.25 0.44 - 3.58 0.680
13 0.87 0.34 - 2.25 0.774
Overall model    < 0.001
Model 2
2002 birth cohort Baseline   
5 0.31 0.08 - 1.20 0.091
6 0.22 0.06 - 0.84 0.027
7 0.46 0.14 - 1.51 0.198
10 0.12 0.03 - 0.47 0.002
Overall model    0.032