Table 1 Primary care, secondary care and administrative data sets used by the included studies.

General Practice data sets

X

X

X

X

X

X

X

X

X

X

 CPRD

X

X

X

X

X

X

 OPCRD

X

X

X

 Nottingham General Practices

X

 North Glasgow EMIS General Practices

X

 North East London EMIS General Practices

X

 Sweden Primary Care Centres

X

Health Insurance Registers

X

X

 Danish Health Insurance

X

 Massachusetts Medicaid

X

Hospital Databases

X

X

X

X

X

 NHS Health Board Records

X

 UK HES

X

X

X

 UK SUS

X

Community Prescribing Register

X

National Registers

X

X

 Swedish

X

 Danish

X

Health Insurance Databases

X

 Massachusetts Medicaid

X