Table 3.
OTF‐W incidence rates per 100 herd years at risk and unadjusted incidence rate ratios (IRRs) for central and buffer intervention areas versus the central and buffer comparison areas, respectively, in Somerset and Gloucestershire, for each 12‐month reporting period
| 12‐month Reporting period | Intervention central | Comparison central | IRR | 95% Confidence interval | p value | Intervention buffer | Comparison buffer | IRR | 95% Confidence interval | p value | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Somerset | ||||||||||||
| 3 years prior | 19.7 | 15.0 | 1.32 | 0.86 | 1.95 | .173 | 10.7 | 13.6 | 0.79 | 0.35 | 1.54 | .503 |
| 2 years prior | 21.3 | 13.3 | 1.60 | 1.06 | 2.35 | .022 | 17.0 | 13.5 | 1.26 | 0.67 | 2.18 | .407 |
| 1 year prior | 23.0 | 15.3 | 1.50 | 0.97 | 2.24 | .054 | 16.4 | 15.3 | 1.07 | 0.56 | 1.89 | .778 |
| Year 1 | 18.9 | 14.5 | 1.30 | 0.83 | 1.95 | .209 | 17.1 | 17.3 | 0.99 | 0.53 | 1.70 | .998 |
| Year 2 | 14.0 | 14.4 | 0.97 | 0.58 | 1.53 | .910 | 11.7 | 15.6 | 0.75 | 0.35 | 1.42 | .384 |
| Gloucestershire | ||||||||||||
| 3 years prior | 14.6 | 13.5 | 1.08 | 0.71 | 1.59 | .683 | 13.0 | 16.2 | 0.81 | 0.44 | 1.38 | .437 |
| 2 years prior | 11.4 | 14.8 | 0.77 | 0.48 | 1.19 | .231 | 9.4 | 15.0 | 0.62 | 0.29 | 1.18 | .136 |
| 1 year prior | 7.7 | 14.9 | 0.52 | 0.29 | 0.86 | .006 | 14.0 | 16.9 | 0.83 | 0.46 | 1.39 | .488 |
| Year 1 | 9.5 | 14.8 | 0.64 | 0.39 | 1.02 | .049 | 12.9 | 14.0 | 0.93 | 0.50 | 1.58 | .802 |
| Year 2 | 9.2 | 12.4 | 0.74 | 0.44 | 1.19 | .213 | 12.1 | 14.6 | 0.83 | 0.44 | 1.43 | .511 |