Table 5.
Site-specific study types
| Type of Study | Number of Studies |
|---|---|
| Observational study | |
| Retrospective cohort | 35 |
| Prospective cohort | 29 |
| Cohort study | 28 |
| Case-control study | 20 |
| Cross-sectional study | 7 |
| Community survey | 1 |
| Time series study | 0 |
| Nested case-control study | 0 |
| Ecological study | 0 |
| Treatment study | |
| Randomized controlled trial | 24 |
| Nonrandomized trial | 6 |
| Nonblind trial | 4 |
| Double-blind randomized trial | 2 |
| Single-blind randomized trial | 0 |
| Adaptive clinical trial | 0 |
| Review study | |
| Literature review | 15 |
A complete list of the site-specific manuscripts can be found in the Supplemental Digital Content (http://links.lww.com/BCR/A37).