Table 2.
Quality assessment of methodology of included studies.
| References | Sequence generation | Allocation concealment | Blinding | Incomplete outcome data | Selective outcome reporting | Other sources of bias | |
|---|---|---|---|---|---|---|---|
| Therapist and participants | Outcome assessors | ||||||
| Feng et al. (2019) | Low risk | Low risk | Unclear | Unclear | Low risk | Low risk | Low risk |
| Jiang et al. (2018) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Chen et al. (2018) | Low risk | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk |
| Jia et al. (2017) | Low risk | Unclear | Low risk | Low risk | Low risk | Low risk | Low risk |
| Peng et al. (2017) | Low risk | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Lou et al. (2017) | Low risk | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Guan (2017) | Low risk | Unclear | Unclear | Unclear | Low risk | High risk | Low risk |
| Wei et al. (2016) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Lin (2016) | Low risk | Unclear | Unclear | Unclear | Unclear | High risk | Low risk |
| Wang et al. (2015) | Low risk | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Gu et al. (2014) | Low risk | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Yan et al. (2014) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Wang et al. (2014) | Low risk | Unclear | Unclear | Low risk | Low risk | Low risk | Low risk |
| Zhu (2014) | Low risk | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Lin et al. (2014) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Li T. et al. (2014) | Low risk | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Yin et al. (2013) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Sun (2013) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Hu et al. (2010) | Low risk | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Jia et al. (2010) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Zhu et al. (2010) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Li et al. (2009) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Liu et al. (2008) | Low risk | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Zhao et al. (2007) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Luo et al. (2006) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Jiang et al. (2004) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Dong et al. (2002) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Li et al. (2002) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Hou et al. (2000) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |
| Ou et al. (1999) | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Low risk |