Table 1.

Demographic characteristics of pilot and control sites

	Pilot sites				Control sites
	Durham & Darlington	Nottingham	Lincolnshire	Luton	North of Tyne	Norfolk	Leicester city
Population (000's)	620	305	735	700 (Northamptonshire)	780	740	280
SHA	North east	East midlands	East midlands	East of england	North East	East of England	East Midlands
ONS Area Classification of Primary Care Organisations	Industrial hinterlands	Centres with industry	Prospering small towns	London suburbs	Industrial hinterlands Prospering small towns	Prospering small towns	Centres with industry
ONS Rural/Urban Local Authority Classification	Predominantly urban predominantly rural	Predominantly urban	Predominantly rural	Predominantly urban	Predominantly urban Predominantly rural	Predominantly rural	Predominantly urban
NHS 111 service live	August 2010	November 2010	November 2010	December 2010

NHS, National Health Service; ONS, Office of National Statistics; SHA, Strategic Health Authority.