Variable | Number | Percent |
---|---|---|
Location | ||
 Urban or periurban | 14 | 25 |
 Rural or semi rural | 34 | 59 |
 Mixed | 9 | 16 |
Decade of publication | ||
 1990 | 2 | 4 |
 2000 | 15 | 26 |
 2010 | 40 | 70 |
Study design | ||
 RCT | 44 | 77 |
 Non-RCT | 2 | 4 |
 Controlled before-after study | 8 | 14 |
 Historical controlled study | 2 | 4 |
 Interrupted time series | 1 | 2 |
Region | ||
 Latin America/Caribbean | 4 | 7 |
 East Asia/Pacific | 3 | 5 |
 Sub-Saharan Africa | 28 | 49 |
 South Asia | 21 | 37 |
 Middle East/North Africa | 1 | 2 |
Outcome category | ||
 Immunisation | 20 | 35 |
 Health care utilisation | 27 | 47 |
 Compliance | 2 | 4 |
 Combination | 8 | 14 |
Intervention category | ||
 Delivery of services closer to or at home | 7 | 12 |
 Health promotion/education programme | 23 | 40 |
 Service level improvements | 10 | 18 |
 Text messages | 5 | 9 |
 Financial or other incentives | 12 | 21 |