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Table 4 The effect of risk factors on reinfection lice after eradication*.

From: Eradication of Lice in Cattle

Risk factor Number of herds (n = 28) Result 15–18 months after the eradication Relative risk p-value Fisher's exact test One tailed
   Free Lice Present   
Purchase of livestock or use of common pasture 20 12 8 1.41 (0.93 – 2.13) 0.17
Identified failure in precautions for livestock 9 2 7 5.25 (1.44 – 19.11) 0.005
Identified failure in precautions for persons 28 19 9 - -
  1. *The analysis was based on herds which succeeded with the eradication from both the pilot group and the main group.