Studies | Quality Indicators from Newcastle-Ottawa scale | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
 | 1 | 2 | 3 | 4 | 5A | 5B | 6 | 7 | 8 | Total score |
Yang & Bao, 2003 | Yes | No | No | Yes | Yes | Yes | No | Yes | No | 5 |
Tang, 2008 | Yes | No | No | Yes | Yes | Yes | No | Yes | No | 5 |
Long et al., 2008 | Yes | No | No | Yes | Yes | Yes | No | Yes | No | 5 |
Zhang et al., 2008 | Yes | No | Yes | Yes | Yes | Yes | No | Yes | No | 6 |
Tao et al., 2005 | Yes | No | Yes | Yes | Yes | Yes | No | Yes | No | 6 |
Liu et al., 2001 | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | No | 7 |
Zhang et al., 2009 | Yes | No | Yes | Yes | Yes | Yes | No | Yes | No | 6 |
Wang et al., 2005 | Yes | No | Yes | Yes | Yes | Yes | No | Yes | No | 6 |
Tian et al., 2005 | Yes | No | No | Yes | Yes | Yes | No | Yes | No | 5 |
Liu, 2006 | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | No | 7 |
Yuan & Zheng, 2004 | Yes | No | No | Yes | Yes | Yes | No | Yes | No | 5 |
Gao et al., 1989 | Yes | No | No | Yes | Yes | Yes | No | Yes | No | 5 |
Chen & Gao, 2010 | Yes | No | No | Yes | Yes | Yes | No | Yes | No | 5 |
She, 2009 | Yes | No | No | Yes | Yes | Yes | No | Yes | Yes | 6 |
Zhao et al., 2001 | Yes | No | No | Yes | Yes | Yes | No | Yes | Yes | 6 |
Wan et al., 2004 | Yes | No | Yes | Yes | Yes | Yes | No | Yes | No | 6 |
Zhang et al., 2003 | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | No | 7 |