Table 3.

Significant canine facility and vector-related risk factor associations determined from analysis of data from 37 canine facility surveillance locations.

Outcome variable	Risk factor (predictor variable)	Eta-squareda	Odds ratiob	Confidence interval for odds ratio	Risk factor designation
No. of CPV cases (continuous data)	Fly numbers (continuous)	0.021	N/A	N/A	Vector
	Canine facility design (binary)	0.036			Vector
	Fly CPV status (binary)	0.139			Vector
Fly CPV status (binary)	Canine facility design (binary)	N/A	19.7	(2.7–136.01)	Canine facility
	Fly numbers (continuous)		1.004	(0.996–1.012)	Canine facility

^aThe Eta-squared values are a measure of the association or effect size and are interpreted as follows: 2.1% of the variation in the number of CPV cases that can be explained by the variation in the number of flies captured, 3.6% of the variation in the number of CPV cases that can be explained by the variation in the canine facility design, and 13.9% of the variation in the number of CPV cases that can be explained by the variation in the fly CPV result.

^bThe odds ratio values are interpreted as the odds of a fly CPV positive result at an open facility design. The odds of a fly testing positive for CPV at an open facility design is 19.17 times greater than a fly testing positive at a closed facility design. For every additional fly captured, the odds of a fly CPV positive result at an open facility design increases by 0.004 or 0.4%.