Table 1.

Population A: the detection of CnNPHV RNA by measured variable.

Measured variable		CnNPHV PCR				Totala
		Positive		Negative
		Number	%	Number	%	Number	%
Year	1999	13	27.1	22	13.6	35	16.7
	2000	18	37.5	66	40.7	84	40.0
	2001	17	35.4	74	45.7	91	43.3
Length of stay	1–7	5	10.4	13	8	18	8.6
	8–14	25	52.1	83	51.2	108	51.4
	15–21	6	12.5	26	16.0	32	15.2
	22–28	5	10.4	17	10.5	22	10.5
	>28	7	14.6	23	14.2	30	14.3
Clinical score	1	14	29.2	60	37.0	74	35.2
	2	5	10.4	32	19.8	37	17.6
	3	24	50.0	51	31.5	75	35.7
	4	3	6.3	6	3.7	9	4.3
	5	2	4.2	13	8.0	15	7.2
Histology score	0	3	6.3	15	9.3	18	8.6
	1	30	62.5	87	53.7	117	55.7
	2	10	20.8	42	25.9	52	24.7
	3	5	10.4	18	11.1	23	11.0
Co infection	Y	20	41.7	61	37.7	81	38.6
	N	28	58.3	101	62.3	129	61.4
Total		48	100	162	100	210	100

^aThe total % represents the proportion of dogs in the measured variable out of the total 210 dogs.