Table 1. The odds ratio for infestation with R. appendiculatus, at 95% confidence intervals (CI).

Risk factor Level Odds ratio 95% CI P value AEZ Grazing system       Lowland Fenced 1.26 2.57–55.7** 0.05 Lowland Free range 183.09 52.45–906.87**   Lowland Tethered 365.04 45.60–8433.78**   Lowland Zero grazing 0.63 .03–5.42   Midland and upland Fenced 0.99 .17–5.75   Midland and upland Free range 0.52 .02–4.62   Midland Tethered 1.52 .30–8.33   Midland Zero grazing 0.16 .01–1.34   Upland Tethered 2.58 .74–12.06   Upland Zero grazing 1 –   Age group (months)         0–3   0.26 .09–.71* 0.05 4–12   0.19 .08–.44*   13–18   1.55 .31–6.55   >18   1 –

* Low risk of infestation ** High risk of infestation