Figure 4

Adjusted incidence rate ratios (central estimates and 95% confidence intervals) for Officially Tuberculosis Free-Withdrawn (OTF-W) incidence in cattle herds in inner and outer zones of intervention central zones compared to in the inner and outer zones of the comparison area central zones. Inner zone herds were from farms with a geolocation two or more km inside the boundary to the central zone. Outer zone herds were from farms with a geolocation within two km of the boundary to the central zones. Annual incidence rate ratios (IRRs) for inner zone herds over four years were estimated in models adjusting for intervention area, OTF-W incidence rate in the three years prior to baseline, median herd size, percentage of flood zone 3 land and quintiles for total numbers of badgers removed between 1972 and 2006. Annual incidence rate ratios (IRRs) for inner zone herds over two years were estimated in models adjusting for intervention area, OTF-W incidence rate in the three years prior to baseline, median herd size, percentage of flood zone 3 land, percentage of dairy herds, badger density and the percentage of farms with all land in the central zone. Annual incidence rate ratios (IRRs) for outer zone herds over two years were estimated in models adjusting for intervention area, OTF-W incidence rate in the three years prior to baseline, median herd size, percentage of urban land, percentage of farms with at least one land parcel in area and percentage of land that was in a Randomised Badger Culling Trial (RBCT) Proactive area. Annual incidence rate ratios (IRRs) for outer zone herds over four years were estimated in models adjusting for intervention area, OTF-W incidence rate in the three years prior to baseline, median herd size, percentage of dairy herds, percentage of farms with at least one land parcel in area and percentage of land that was in a RBCT proactive area.