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Table 2 × 2 Analysis of Positive vs. Negative Pools by Trap

From: Bluetongue virus infection creates light averse Culicoides vectors and serious errors in transmission risk estimates

Trap Positive pools Negative pools Total
CO2 80 132 212
  39.6 172.4  
UV 8 137 145
  27.1 117.9  
CO2 + UV 38 279 317
  59.3 257.7  
Total 126 548 675
  1. × 2 = 76.52, df = 2, p < 0.001
  2. Within trap type, the first row of the table shows the observed values and the second row shows the expected values