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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
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