Table 4

Comparison of cases and controls for CPRD and QResearch studies

CPRDQResearch
Number of patients
 Cases66832266
 Controls26 7329064
Median age in years
 Cases8080
 Controls8080
Male (%)
 Cases53.655.7
 Controls53.655.7
Median duration of IHD (months)
 Cases21.320.3
 Controls21.421.0
N (%) prescribed statins
 Cases1108 (16.6)445 (19.6)
 Controls6083 (22.8)2303 (25.4)
Of those prescribed statins, N (%) taking them for >12 months
 Cases572 (51.6)228 (51.2)
 Controls3398 (55.9)1336 (58)
  • CPRD, Clinical Practice Research Datalink; IHD, ischaemic heart disease.