Fig. 1

a–c Proportion of CPRD and HES populations with at least one ethnicity recording. Proportions (%) of all acceptable and currently registered acceptable patients with at least one ethnicity record, including and excluding unknown ethnicity codes; additionally for primary care-only data, the proportions of all acceptable patients registered at their GP prior to QOF ethnicity recording incentivisation (pre-1 April 2006), during QOF incentivisation (1 April 2006–31 March 2011), and after QOF incentivisation (from 1 April 2011) for a the UK population in CPRD GOLD, b the English population in CPRD Aurum, and c the English population using CPRD-HES