Characteristics of systematic reviews included in analysis
| Number of reviews | % of category total | |
|---|---|---|
| Topic of systematic review | ||
| Healthcare intervention | 25 | 42 |
| Other health intervention | 9 | 15 |
| Observational epidemiology | 22 | 37 |
| Qualitative | 3 | 5 |
| Journal | ||
| Addiction | 2 | 3 |
| American Journal of Public Health | 2 | 3 |
| Annals of Family Medicine | 3 | 5 |
| Annals of Internal Medicine | 8 | 14 |
| BMJ | 8 | 14 |
| British Journal of General Practice | 2 | 3 |
| Cochrane Database | 14 | 24 |
| JAMA | 3 | 5 |
| Lancet | 3 | 5 |
| Pediatrics | 6 | 10 |
| PLoS Medicine | 3 | 5 |
| Preventive Medicine | 1 | 2 |
| Social Science and Medicine | 4 | 7 |
| Number of outcomes | ||
| Single | 11 | 19 |
| Multiple | 48 | 81 |
| Summative synthesis | ||
| Meta-analysis | 44 | 75 |
| No meta-analysis | 15 | 25 |