Table 2.

Kennel population serological survey analysis: seroconversion and seroconversion subcategory by measured variable

Variable	Seroconversion in dogs				ORc	95% CI (OR)	P valuea	Total dogs
	Yes		No
	No.	%	No.	%				No.	%
Maximum respiratory score
1	13	39.4	20	60.6	Ref		<0.001b	33	100
2	22	53.7	19	46.3	1.8	0.7–4.5	0.2	41	100
3	103	77.4	30	22.6	5.3	2.4–11.8	<0.001	133	100
4	7	87.5	1	12.5	10.8	1.2–98.0	0.04	8	100
Disease
Yes	132	72.5	50	27.5	4.1	1.9–8.8	<0.001	182	100
No	13	39.4	20	60.6	Ref		<0.001b	33	100
Severe disease
Yes	110	78.0	31	22.0	4.0	2.2–7.2	<0.001	141	100
No	35	47.3	39	52.7	Ref		<0.001b	74	100
Age (yrs)
≤1	53	84.1	10	15.9	Ref		0.001b	63	100
2	75	64.7	41	35.3	0.3	0.2–0.7	0.007	116	100
≥3	17	47.2	19	52.8	0.1	0.06–0.4	<0.001	36	100
Entry status
Gift	44	64.7	24	35.3	Ref		0.6b	68	100
Stray	101	68.7	46	31.3	1.2	0.6–2.2	0.6	147	100
Season
Winter	26	66.7	13	33.3	Ref		0.6	39	100
Spring	44	62.0	27	38.0	0.8	0.4–1.8	0.6	71	100
Summer	37	74.0	13	26.0	1.4	0.6–3.6	0.4	50	100
Autumn	38	69.1	17	30.9	1.1	0.5–2.7	0.8	55	100

^aWald P values are from logistic regression except when otherwise noted.

^bChi-square P value.

^cRef, the reference against which the OR was calculated.