Table 2.

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

Measured variable		CnNPHV PCR				Total
		Positive		Negative
		Number	%	Number	%	Number	%
Clinical score	1	7	63.6	6	85.7	13	65.0
	2	1	9.1	0	0.0	1	5.0
	3	3	27.3	1	14.3	4	20.0
	4	0	0.0	0	0.0	0	0.0
	5	0	0.0	0	0.0	0	0.0
	Missing data	1	9.1	1	14.3	2	10.0
	Total	12	100a	8	100a	20	100b
Co-infection	Y	6		2		8	40.0
	N	6		6		12	60.0
	Total	12	60.0b	8	40.0b	20	100.0b
Trachea histology score	0	0		2		2
	1	1		5		6
	2	2		0		2
	3	2		1		3
	4	2		3		5
	Not examined	0		2		2
	Total	7	35.0b	13	65.0b	20	100.0b
Cilia (Trachea) histology score	0	0		2		2
	1	0		1		1
	2	2		3		5
	3	2		1		3
	4	3		4		7
	Not examined	0		2		2
	Total	7	35.0b	13	65.0b	20	100.0b
Lung histology score	0	0		3		3
	1	1		5		6
	2	0		8		8
	3	1		0		1
	4	1		1		2
	Not examined	0		0		0
	Total	3	15.0b	17	85.0b	20	100.0b
Liver histology score	0	4		4		8
	1	1		4		5
	2	2		2		4
	3	0		1		1
	4	0		0		0
	Not examined	1		1		2
	Total	8	40.0b	12	60.0b	20	100.0b

^aThe total % represents the proportion of dogs by CnNPHV PCR results.

^bThe total % represents the proportion of the total 20 dogs examined.