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