Is It a New Approach for Treating Senile Hypertension with Kidney-Tonifying Chinese Herbal Formula? A Systematic Review of Randomized Controlled Trials

Table 2

Assessment of risk of bias in included studies.

Study	Random sequence generation	Allocation concealment	Blinding	Incomplete outcome data	Selective reporting	Free of other biases	Summary assessments
Lu et al., 2007 [16]	Low risk	Unclear	Unclear	Unclear	Unclear	Low risk	High risk
Hu et al., 2001 [17]	Unclear	Unclear	Unclear	Unclear	Unclear	Unclear	High risk
Huang et al., 2007 [18]	Unclear	Unclear	Unclear	Unclear	Unclear	Unclear	High risk
Kong, 2003 [19]	Unclear	Unclear	Unclear	Unclear	Unclear	Unclear	High risk
Zhang and Li, 2006 [20]	Unclear	Unclear	Unclear	Unclear	Unclear	Unclear	High risk
Zhang et al., 2008 [21]	Unclear	Unclear	Unclear	Unclear	Unclear	Unclear	High risk