"Figure 7: Average registration delay for deaths relating to drug misuse, by country, deaths registered in 2016 and 2017","" "England and Wales","" "","" "Notes","1. The registration delay is calculated as the difference between the date each death occurred and the date it was registered, measured in days. The average delay is represented using the median. 2. Cause of death was defined using the International Classification of Diseases, Ninth Revision (ICD-9) for the years 1993 to 2000 and Tenth Revision (ICD-10) from 2001 onwards. More details can be found in the Quality and Methodology Information. 3. Figures are for deaths registered, rather than deaths occurring in each calendar year. 4. Deaths of persons usually resident in each country and region, based on boundaries as of May 2018." "Unit","Average (median) delay in days" "","" "Registration year","2016","2017" "England","158","172" "Wales","159.5","165"