Chinese Patent Medicine Liu Wei Di Huang Wan Combined with Antihypertensive Drugs, a New Integrative Medicine Therapy, for the Treatment of Essential Hypertension: A Systematic Review of Randomized Controlled Trials

Table 2

Quality assessment of the included randomized controlled trials.

Included trials	Sequence generation	Allocation concealment	Blinding of participants personnel and outcome assessors	Incomplet outcome data	Selective outcome reporting	Other sources of bias	Risk of bias
Cai 2004 [18]	Unclear	Unclear	Unclear	Yes	No	Unclear	High
Zhang 2007 [19]	Unclear	Unclear	Unclear	Yes	No	Unclear	High
Chen et al. 2008 [20]	Unclear	Unclear	Unclear	Yes	No	Unclear	High
Zhang et al. 2004 [21]	Unclear	Unclear	Unclear	Yes	No	Unclear	High
Zhou et al. 2003 [22]	Unclear	Unclear	Unclear	Yes	No	Unclear	High
Hu et al. 1994 [23]	Unclear	Unclear	Unclear	Yes	No	Unclear	High