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Table 2 The distribution of independent variables among 46 surveyed farms

From: The epidemiology of Clostridium perfringens type A on Ontario swine farms, with special reference to cpb2-positive isolates

Independent Variable Percentage of Cpb2-positive farms Univariable analysisP-value (sample level)
Type of operation (sample n = 220) Farrowing (farm n = 30) 73 0.012
  Grower-finisher (farm n = 16) 25  
Other species (sample n = 212) Not present (farm n = 23) 57 0.004
  Present (farm n = 23) 57  
Herd Size (sample n = 217) Small (<1000) (farm n = 9) 33 Referent
  Medium (≥1000-3000) (farm n = 28) 61 0.272
  Large (>3000) (farm n = 9) 67 0.018
Sow Flow (sample n = 84) All-in/all-out (farm n = 16) 75 0.417
  Continuous (farm n = 14) 71  
Weanling Flow (sample n = 15) All-in/all-out (farm n = 23) 70 0.326
  Continuous (farm n = 8) 87.5  
Grower-Finisher Flow (sample n = 20) All-in/all-out (farm n = 27) 48 0.327
  Continuous (farm n = 13) 54  
Antibiotic usage (sample n = 66) Yes (farm n = 7) 100 0.304*
  No (farm n = 23) 65  
Diarrhea (sample n = 58) Yes (farm n = 11) 82 0.792*
  No (farm n = 19) 68  
  1. *Exact logistic regression.