Table 2.

Metadata for clinical data sources in external dataset (SIVE II)

Data Source	Number of Records	Number of Individuals	Extraction Date	Data Specification Date Range
Primary Care Prescribing	29 360 448	1 073 377	May 2017	January 2003–March 2017
Primary Care Encounters	31 878 423	1 887 957	May 2017	January 2000*–March 2017
Accident & Emergency	4 116 561	1 247 314	April 2017	June 2007– August 2016
Hospital Inpatient Admissions	3 549 174	794 937	April 2017	January 2000–March 2017
Mortality	NA	215 466	April 2017	January 2000– March 2017

*Diagnosis codes entered in this period, but post-dated from 1940 onwards retained.