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Jadad quality score of the trials.
| Study, year | Randomization method | Blinding | Withdrawals or dropouts | Total |
|---|---|---|---|---|
| Kouroumalis 1998 | 2 | 0 | 1 | 3 |
| Farooqi 2000 | 2 | 0 | 1 | 3 |
| Wu 2001 | 1 | 0 | 1 | 2 |
| Yuen 2002 | 2 | 0 | 1 | 3 |
| Yang 2003 | 1 | 0 | 1 | 2 |
| Zhang 2004 | 2 | 0 | 1 | 3 |
| Becker 2007 | 2 | 2 | 1 | 5 |
| Dimitroulopoulos 2007 | 2 | 1 | 1 | 4 |
| Ou 2007 | 1 | 0 | 1 | 2 |
| Barbare 2009 | 2 | 2 | 1 | 5 |
| Zhang 2010 | 1 | 0 | 1 | 2 |
