Table 3.

Descriptive statistics and univariable Cox regression results for risk factors associated with the hazard of early‐onset urinary incontinence in the neutered‐only subset of bitches under primary veterinary care in the UK (with date of neuter as the start point) (n=23,499)

Variable	Category	Non‐case no.	Case no.	Hazard ratio	95% CI*	Category P‐value	Variable P‐value
Age at neuter (months)	<6	3355	63	0.94	0.71 to 1.25	0.665	0.190
	6–<12	10,352	191	Base
	12–<24	5313	113	1.25	0.99 to 1.58	0.059
	≥24	4067	45	1.12	0.81 to 1.56	0.492
Bodyweight (kg)	<10.0	9251	67	Base			<0.001
	10.0 to <20.0	6489	96	1.98	1.45 to 2.71	<0.001
	20.0 to <30.0	4079	130	4.18	3.12 to 5.62	<0.001
	≥ 30.0	2692	110	4.84	3.57 to 6.56	<0.001
	Not recorded	576	9	7.79	3.88 to 15.64	<0.001
Breed	Crossbreed – non‐designer	5486	77	Base			<0.001
	Irish setter	10	5	26.49	10.72 to 65.49	<0.001
	Dalmatian	87	11	7.78	4.14 to 14.63	<0.001
	Hungarian vizsla	50	5	6.07	2.46 to 15.01	<0.001
	Dobermann	59	5	6.02	2.44 to 14.88	<0.001
	Weimaraner	74	7	5.56	2.56 to 12.05	<0.001
	Rottweiler	173	10	5.10	2.64 to 9.85	<0.001
	Boxer	262	13	3.16	1.76 to 5.69	<0.001
	English springer spaniel	521	24	2.94	1.86 to 4.65	<0.001
	German shepherd dog	536	20	2.72	1.66 to 4.44	<0.001
	Siberian husky	223	6	2.22	0.97 to 5.09	0.061
	Labrador retriever	1760	51	1.80	1.27 to 2.57	0.001
	Border collie	648	16	1.57	0.92 to 2.69	0.101
	West Highland white terrier	466	11	1.40	0.74 to 2.63	0.300
	Staffordshire bull terrier	1588	19	1.03	0.62 to 1.70	0.919
	Purebreed – other	7637	97	0.85	0.63 to 1.15	0.283
	Crossbreed – designer	1015	14	0.83	0.47 to 1.47	0.519
	Cocker spaniel	1030	10	0.57	0.30 to 1.11	0.099
	Jack Russell terrier	1459	11	0.52	0.28 to 0.98	0.043
	Not recorded	3	0	~	~	~
Vet group	1			Base			0.022

CI Confidence interval