Kent Fire and Rescue Service ranks all its 5,241 output areas according to risk using incident data, demographics, lifestyle data and information from partners. Output areas are defined by the Office of National Statistics. They have a population of about 250 people and their boundaries are fixed to allow comparisons through time. Sixty per cent of all accidental fires in the home occurred in the top 40 per cent of ranked output areas. As a result the fire service has been able to target its prevention work where it can have greatest impact. In 2007/08 the service had the third lowest level of deaths from fire in the home nationally.