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Table 1 Cross-tabulation of corvid sighting and corvid submission results

From: A bird's eye view: using geographic analysis to evaluate the representativeness of corvid indicators for West Nile virus surveillance

   Number of Local Health Areas submitting corvids for West Nile virus testing
   Significantly fewer than expected No significant difference from expected Significantly more than expected
Number of Local Health Areas with public reports of dead corvid sightings Significantly fewer than expected 5 6 1
  No significant difference from expected 4 32 14
  Significantly more than expected 2 8 11
  1. Statistical significance was determined using the exact Poisson distribution and a significance level of 0.05.