Standardised mortality ratios--the effect of smoothing ward-level results.

Geographical indicators of mortality provide one of the most important means of assessing the health of populations and are particularly effective in identifying inequalities in health. Geographical mortality indicators have regularly been produced by the Office for National Statistics, but not normally for areas smaller than local authorities. In order to allow variations in mortality within local authorities to be examined, in 2006 ONS published Standardised Mortality Ratios (SMRs) for wards in England and Wales, based on deaths in 1999-2003.