Excess winter mortality and excess winter mortality index, by age group and government office region of England and Wales (1991/92 - latest available).
Excess winter mortality is calculated as winter deaths (deaths occurring in December to March) minus the average of non-winter deaths (April to July of the current year and August to November of the previous year).
The Excess winter mortality index is calculated as excess winter deaths divided by the average non-winter deaths, expressed as a percentage.
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