a significant trendP < 0.01
a nonsignificant trendP = 0.735
In the >4 weeks treatment duration subgroup, meta-analysis indicated a nonsignificant trend for reduction in SBP between experimental and control groups [WMD = 0.55, 95% CI (−2.63, 3.72), P = 0.735]; however, in the subgroup with treatment duration ≤ 4 weeks, there was a significant trend for reduction between the two groups [WMD = −4.42, 95% CI (−6.29, −2.20) P < 0.01] ( Figure 7 , Supplementary Figure 10 ) .