- As defined by the European Monitoring Centre for Drugs and Drug Addiction (EMCDDA).
- For all countries apart from Scotland, the figures are taken from Table A6 of the EMCDDA's 'European Drug Report 2017', which is available from the European Monitoring Centre for Drugs and Drug Addiction website. Most countries' figures are for 2015, but some are for 2014 or earlier years. The EMCDDA's Table A6 includes the following footnote: Caution is required when comparing drug-induced deaths due to issues of coding, coverage and under-reporting in some countries.
- Public Health England advised NRS that the figures for the UK are for 2014 - so, for consistency, NRS has used Scotland's figures for that year.
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