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Number of study participants by number of articles and percentage of articles (n = 399).
| Number of study participants | Number of articles N (%) |
|---|---|
| <50 | 143 (35.8) |
| 50–100 | 52 (13.0) |
| 101–500 | 107 (26.8) |
| 501–1500 | 26 (6.5) |
| 1501–10,000 | 20 (5.0) |
| >10,000 | 42 (10.5) |
| Missing or not relevant* | 9 (2.3) |
No participants in study or total not recorded.
