Table S3. Baseline characteristics and Newcastle Ottawa score of observational studies.
| Study | Sample size (n) | No. of males | Age | SD | Study type | Mean follow-up duration (months) | Newcastle-Ottawa Score of observational studies (P: <5 poor; F: 5–7 fair; G: >7 good) |
|---|---|---|---|---|---|---|---|
| Harris 1997 (4) | 19 | 7 | 70.9 | 10.0 | Retrospective | 72 | 6: F |
| Von Kodolitsch 2003 (6) | 38 | – | – | – | Prospective | 31 | 7:F |
| Kitai 2009 (7) | 66 | 25 | 67.8 | 10.1 | Retrospective | 91 | 7:F |
| Song 2009 (8) | 101 | 30 | 65 | 10 | Prospective | 37 | 7:F |
| Moizumi 2004 (9) | 41 | – | – | – | Prospective | 52.9 | 6:F |
| Choi 2014 (12) | 61 | 23 | 68 | 10 | Retrospective | 36 | 5:F |
| Evangelista 2005 (13) | 23 | – | – | – | Retrospective | 19 | 7: F |
| Hata 2014 (16) | 171 | 91 | 69.4 | 11.9 | Prospective | 62.6 | 6: F |
| Ho 2011 (17) | 34 | 18 | 69.7 | 12.4 | Prospective | 30 | 6;F |
| Evangelista 2004 (18) | 12 | – | – | – | Prospective | 3 | 6:F |
| Song 2007 (21) | 51 | 15 | 66 | 11 | Retrospective | - | 5:F |
| Estrera 2009 (22) | 36 | 24 | 63 | 13.5 | Retrospective | 42 (median) | 6:F |
| Motoyoshi 2003 (23) | 36 | 20 | 68 | 9 | Prospective | 39 | 7:F |
| Lee 2014 (24) | 61 | – | – | – | Prospective | 36 | 6:F |
| Nienaber 1995 (25) | 12 | – | 52 | 10 | Prospective | 78 | 6:F |
| Harris 2012 (26) | 64 | 37 | 69.6 | 9.6 | Prospective | 12 | 6:F |
| Shimizu 2000 (27) | 13 | – | – | – | Retrospective | 37 | 6:F |
| Song 2001 (28) | 24 | 5 | 67 | 10 | Retrospective | 17 | 5:F |
| Sueyoshi 1997 (29) | 13 | – | – | – | Retrospective | 42 | 5:F |