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Levels of Evidence of Clinical Hand Surgery Research Over the 20-Year Period.
| Level of evidence | 1993 | 1998 | 2003 | 2008 | 2013 | Total (%) |
|---|---|---|---|---|---|---|
| 1a, 1b, 1c | 2 | 3 | 8 | 12 | 9 | 34 (3.5) |
| 2a, 2b | 7 | 13 | 16 | 18 | 24 | 78 (8.0) |
| 3a, 3b | 14 | 35 | 26 | 34 | 45 | 154 (15.8) |
| 4 | 86 | 96 | 93 | 79 | 86 | 440 (45.2) |
| 5 | 58 | 69 | 38 | 48 | 53 | 266 (27.3) |
