| •Study design |
| Administrative database comparative study |
| Administrative database case–control study |
| Administrative database case series |
| •Why database was created clearly stated |
| •Description of database's inclusion/exclusion criteria |
| •Description of methods for reducing bias in database |
| •Codes and search algorithms reported |
| •Rationale for coding algorithm reported |
| •Code accuracy reported |
| •Code validity reported |
| •Clinical significance assessed |
| •Is the period of data consistent with the outcome data? |
| •Statement regarding whether data stems from single or multiple hospital admissions |
| •Statement regarding whether data stems from single or multiple procedures |
| •Accounting for clustering |
| •Number of criteria met (maximum: 12) |
