| Intervention category* | Method | Number of studies |
| Professional | Distribution of educational materials | 5 |
| Professional | Educational meetings | 7 |
| Professional | Reminders | 3 |
| Professional | Educational outreach visits | 2 |
| Professional | Audit and feedback | 1 |
| Professional | Local opinion leaders | 1 |
| Professional | Guideline care | 3 |
| Organisational | Revision of professional roles | 1 |
| Financial | Provider incentive (financial) | 1 |
*Category of intervention as classified by the EPOC taxonomy.