Table 1.

Demographic data for the conditions under study

Disease	% in Total Study Population	Females (n)	Neutered Females (n)	Males (n)	Neutered Males (n)	Ratio of Intact to Neutered	Ratio of Female to Male Prevalence
Congenital
Aortic Stenosis	0.49	134	88	144	77	278 : 165	50.1 : 49.9
Mitral Valve Dysplasia	0.22	44	57	47	49	91 : 106	51.3 : 48.7
Patent ductus arteriosus	0.51	258	73	102	25	360 : 98	72.3 : 27.7
Portosystemic Shunt	0.74	161	172	158	178	319 : 350	49.8 : 50.2
Ventricular Septal Defect	0.17	63	25	53	16	116 : 41	56.1 : 43.9
Ocular
Early onset Cataracts	0.88	152	241	151	246	303 : 487	49.7 : 50.3
Lens Luxation	0.44	39	178	41	138	80 : 316	54.8 : 45.2
Orthopedic
Elbow Dysplasia	1.51	119	431	252	561	371 : 992	40.4 : 59.7
Hip Dysplasia	2.03	187	682	286	673	473 : 1355	47.5 : 52.5
Intervertebral disc disease	5.93	307	2047	819	2168	1126 : 4215	44.1 : 55.9
Patellar Luxation	2.75	284	1095	324	773	608 : 1868	55.7 : 44.3
Ruptured Anterior Cruciate Ligament	1.46	55	693	83	487	138 : 1180	56.7 : 43.3
Cancers
Hemangiosarcoma	0.76	22	289	83	288	105 : 577	45.6 : 54.4
Hyperadrenocorticism (cushings)	1.39	39	704	84	424	123 : 1128	59.4 : 40.6
Lymphoma	1.9	81	733	222	672	303 : 1405	47.7 : 52.3
Mast Cell Tumor	1.82	76	844	175	549	251 : 1393	56.0 : 44.0
Osteosarcoma	0.89	33	343	84	341	117 : 684	46.9 : 53.1
Other
Dilated Cardiomyopathy	0.44	23	116	94	162	117 : 278	35.2 : 64.8
Gastric Dilatation (Bloat)	0.28	25	73	60	93	85 : 166	39.0 : 61.0
Epilepsy	0.87	45	301	105	329	150 : 630	44.4 : 55.6
Vehicular Injury	2.44	328	680	509	683	837 : 1363	45.8 : 54.2