Table 1: Characteristics and methodological quality of the included studies.

Study IDSampleDiagnosis standardInterventionControlCourse (week)Outcome measure

Cai 2004 [18]1621999 WHO—ISH GMHLWDHW plus sustained-release nifedipinesustained-release nifedipine8BP
Zhang 2007 [19]68Hypertension diagnostic criteria (unclear)LWDHW plus nifedipine controlled release tabletNifedipine controlled release tablet4BP
Chen et al. 2008 [20]97CGMH-2005LWDHW plus captoprilcaptopril8BP; adverse effect
Zhang et al. 2004 [21]781993 WHO—ISH GMHLWDHW plus enalaprilenalapril7BP; TCM-SSD
Zhou et al. 2003 [22]1001999 WHO—ISH GMHLWDHW plus nifedipine controlled release tabletNifedipine controlled release tablet18BP; TCM-SSD
Hu et al. 1994 [23]50Hypertension diagnostic criteria (unclear); TCM diagnostic criteria (unclear)LWDHW plus nifedipinenifedipine10BP