PCA Health and Genetics

Deafness prevalence and pigmentation and gender associations in dog breeds at risk

Table 6

Coat pigmentation differences in deafness prevalence


Breed	Color comparisona	N	df	x2	p	F p (d)

Dalmatian	BRBR/BRBL/BLBL	5203 (4650/407/146)	4	4 159.928	< 0.0001
	BR/BL	5204 (4650/554)	2	59.089	< 0.0001

English setter	BR/BL	649 (646/3)	2	18.927	< 0.0001d	0.012

English cocker spaniel	BRBR/BRBL/BLBL	1122 (1118/3/1)	4	92.796	< 0.0001 d	0.009
	BR/BL	1112 (1118/4)	2	21.866	< 0.0001 d	0.035

Bull terrier	BRBR/BRBL/BLBL	659 (658/0/1)	2	8.999	0.011d	0.100

( a )	BRBR, two brown irises; BRBL, one blue iris; BLBL, two blue irises; BR, two brown irises; BL, one or two blue irises.
( b )	Fisher's exact test.
( c )	Data from GMS subset only because the ESAA subset did not record iris color data.
( d )	Excess cells had expected counts less than 5; v2 may not be a valid test.