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Table 2 Factors that affect the intensity of shedding Giardia in dairy herds in the New York City Watershed.

From: Incidence of and risks associated with Giardia infections in herds on dairy farms in the New York City Watershed

Risk Factor Regression Coefficient Standard Error Pr > |t|
Age -0.0142 0.000980 <0.0001
Age 2 0.000015 1.367E-6 <0.0001
Prior Infection Status    
   High risk 0   
   Low Risk 0.2201 0.0840 0.0089
   Intermediate Risk -0.0288 0.0539 0.5939
Season of Infection    
   Summer 0   
   Winter -0.0554 0.0464 0.2324
   Spring -0.1205 0.0495 0.0151
Constant 3.4949 0.0684 <0.0001
  1. Low risk= Herds shedding neither Giardia or Cryptosporidium prior to start of the study
  2. Intermediate risk= Herd shedding Giardia only prior to the start of the study
  3. High risk= Herd shedding both Giardia and Cryptosporidium prior to the star of the study
  4. Winter= November through March
  5. Spring= April through June
  6. Summer= July through October