| Table 1: Types of intervention aimed at improving professional practice in 102 trials | ||
| Intervention | No. of studies | |
| Educational material | 12 | (9) |
| Conference | 17 | (8) |
| Outreach visit | 8 | (3) |
| Use of local opinion leader | 5 | (4) |
| Patient-mediated intervention | 10 | (4) |
| Audit and feedback | 31 | (21) |
| Reminder system | 52 | (35) |
| Marketing | 3 | (0) |
| Multifaceted intervention | 15 | (11) |
| Local consensus process | 8 | (2) |
*Numbers add up to more than 102 because some of the trials examined more than one type of intervention. Numbers in parentheses indicate trials in which comparisons were made against a nonintervention, "usual-care" control group.