Table 2.

Results of Cox proportional hazards model assessing loss to the project.

	Hazard ratio	95% CI		P-value
	eβ	Lower	Upper
Household types
Family	1
More than one adult	0.77	0.71	0.83	<0.001
Retired	0.47	0.4	0.56	<0.001
Single adult	0.81	0.69	0.95	0.01
Not reported	1.14	0.51	2.54	0.75
Smoking status
Non-smokers	1
Smokers	1.21	1.11	1.33	<0.001
Not reported	0.39	0.13	1.17	0.09
Postcode
Full postcode	1
First half only	0.68	0.17	2.62	0.57
Not reported	3.8	1.76	8.23	<0.001
Communications
No telephone contact	1
Telephone contact	0.55	0.51	0.59	<0.001
No email contact	1
Email contact	0.44	0.39	0.51	<0.001
No newsletter subscription	1
Newsletter subscription	1.3	1.18	1.44	<0.001
Other household pets
No other dog	1
Another dog	0.83	0.77	0.9	<0.001