Table 1 Application of study inclusion criteria to identify eligible cardiac surgery patients
Criterion | Patients (N) |
|---|---|
1. Patients who underwent coronary artery bypass graft (CABG), valve repair/replacement, or an aortic operation in English hospitals between January 1, 2010, and Feb 29, 2016, as identified from the linked HES-APC and CPRD databases.† Restrict to the first cardiac surgery (index) observed for each patient during the study period. | 17,339 |
2. Age ≥ 18 years at index cardiac surgery. | 17,142 |
3. Registered with a general practitioner (GP) contributing data to the CPRD for at least one year prior to index. | 7774 |