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Table 3 Comparison records available across different data sources (NB. lack of comparison record does not necessarily imply failure of linkage as some individuals will not have experienced record generating events in relation to all data sources)

From: The Edinburgh Addiction Cohort: recruitment and follow-up of a primary care based sample of injection drug users and non drug-injecting controls

Data source

Records attempted to link

Linkage successful

Scottish Morbidity Register (live confirmed cases)

432

432

Primary care records (live confirmed cases)

432

432

Primary care records (dead confirmed cases)

223

182

General Register Office for Scotland (dead confirmed cases)

223

222

Scottish Prison Service (live confirmed cases)

432

198

Lothian and Borders Police (subset of live confirmed cases)

100

94