The Excess Winter Mortality Index (EWD Index) shows excess winter deaths as a percentage ratio of the expected deaths, based on the non-winter death rate for the period 01 August in year 1 to 31 July in year 3 (as this data shows a 3-year moving average). In other words, EWD is the ratio of extra deaths from all causes in the winter months compared to average non-winter deaths in the same (3-year) period.
The EWD Index is partly dependent on the proportion of Older People in the population as most excess winter deaths affect Older People.
This indicator covers all ages but there is no standardisation in its calculation by age or any other factor. So figures for an area can be influenced for example by the proportion of Older People.
This dataset is updated annually. Source: Public Health England (PHE) Public Health Outcomes Framework (PHOF), indicator 4.15 iii.