Research Article
Tai Chi for Essential Hypertension
Table 2
Quality assessment of included randomized controlled trials.
| Included trials | Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Other sources of bias | Risk of bias |
| Wei et al. 2003 [25] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High | Han et al. 2010 [26] | Stratified sampling | Unclear | Unclear | Unclear | Yes | No | Unclear | Unclear | Wang et al. 2011 [27] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High | Tang 2009 [28] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High | Chen et al. 2011 [29] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High | Mao and Sha 2006 [30] | Stratified sampling | Unclear | Unclear | Unclear | No | No | Unclear | Unclear | Yi et al. 1990 [31] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High | Chen 2011 [32] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High | He et al. 2011 [33] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High | Lo et al. 2012 [34] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High | Wang 2007 [35] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High | Luo 2006 [36] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High | Wang et al. 2007 [37] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High | Zhou 2007 [38] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High | Chen and Lv 2006 [39] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High | Song and Yu 2011 [40] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High | Wang et al. 2011 [41] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High | Lee 2004 [42] | Unclear | Unclear | Unclear | Unclear | Yes | No | Unclear | High |
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