Zhen Gan Xi Feng Decoction, a Traditional Chinese Herbal Formula, for the Treatment of Essential Hypertension: A Systematic Review of Randomized Controlled Trials

Table 1

Characteristics and methodological quality of included studies.

Study ID	Sample	Diagnosis standard	Intervention	Control	Course (week)	Outcome measure
Guo et al.; 2002 [14]	129	Hypertension diagnostic criteria (unclear); GCRNDTCM	ZGXFD	Captopril	4	BP; TCM-SSD; side effect
Mao 2005; [15]	70	1999 WHO -ISH GMH; GCRNDTCM	Modified ZGXFD	Indapamide	3	BP; TCM-SSD
Luo 2008; [16]	45	CGMH-1999; GCRNDTCM	ZGXFD	Captopril	2	BP; TCM-SSD
Liu and Zhong; 2008 [17]	120	CGPMHBP-2004; GCRNDTCM	Modified ZGXFD plus benazepril	Benazepril	3	BP; TCM-SSD
Li and Zheng; 2012 [18]	166	Hypertension diagnostic criteria (unclear); TCM diagnostic criteria (unclear)	Modified ZGXFD	Captopril	4	BP; side effect
Zhou 2000 [19]	300	Hypertension diagnostic criteria (unclear); TCM diagnostic criteria (unclear)	Modified ZGXFD plus nitrendipine	Nitrendipine	4	BP; side effect