The Demographics of Canine Hip Dysplasia in the United States and Canada

Table 4

Severity of CHD by demographic parameters.

Parameter	CHD severity			% severity			value
	Mild	Moderate	Severe	Mild	Moderate	Severe
Age (mos ± 1 sd)	31.4 ± 8.4	32.0 8.9	32.5 ± 9.3	—	—	—	<10^−6
Sex
Male	55,390	31,452	5,264	60.14	34.15	5.72	<10^−6
Female	30,931	16,519	2,740	61.63	32.91	5.46
Laterality
Bilateral	51,085	36,754	7,537	53.56	38.54	7.90	<10^−6
Unilateral	35,236	11,217	465	75.10	23.91	0.99
AKC group
Herding	17,011	8,906	1,723	61.54	32.22	6.23	<10^−6
Hound	1,329	427	52	73.51	23.62	2.88
Working	22,469	14,379	2,371	57.29	36.66	6.05
Sporting	36,994	20,498	3,232	60.92	33.76	5.32
Nonsporting	4,452	2,062	413	64.27	29.77	5.96
Terrier	1,757	605	60	72.54	24.98	2.48
Toy	1,622	800	105	64.19	31.66	4.16
FCI group
Sheep and cattle	17,387	9,106	1,763	61.53	32.23	6.24	<10^−6
Pinscher schnauzer, molossoid, and Swiss Mtn/cattle dog	20,179	13,430	2,371	56.08	37.33	6.59
Terrier	1,563	552	53	72.09	25.46	2.44
Spitz and primitive	4,106	2,120	325	62.68	32.36	4.96
Scent hounds	1,142	511	74	66.13	29.59	4.28
Pointing dogs	4,981	2,496	290	64.13	32.14	3.73
Retrievers, flushers, and water dogs	32,742	18,344	2,976	60.56	33.93	5.50
Companion and toy dogs	3,710	1,178	126	73.99	23.49	2.51
Sighthounds	181	85	3	67.29	31.60	1.12
Geographic group
<30°N	2,760	1,183	199	66.63	28.56	4.80	<10^−6
30–39°N	41,628	22,781	3,711	61.11	33.44	5.45
40–49°N	36,358	20,619	3,498	60.12	34.10	5.78
50°N	5,335	3,235	580	58.31	35.36	6.34
Season of birth
Autumn	19,795	10,644	1,722	61.55	33.10	5.35	<10^−6
Winter	21,512	12,101	1,960	60.47	34.02	5.51
Spring	24,728	14,456	2,503	59.32	34.68	6.00
Summer	20,286	10,770	1,819	61.71	32.76	5.53