Table 2.

Subgroup analyses based on various criteria for systolic blood pressure.

Subgroup	n	MD (95% CI)	Heterogeneity (%)	P value
Total sample size
>80	6	−16.33 [−19.45, −13.22]	79	P < 0.00001
≤80	4	−13.85 [−19.67, −8.04]	96	P < 0.00001
Intervention time
≤15 days	4	−11.62 [−18.75, −4.50]	95	P < 0.00001
>15 days	5	−16.52 [−20.81, −12.22]	93	P < 0.00001
Control type
AP + AHDs vs. AHDs	7	−14.42 [−19.16, −9.68]	94	P < 0.00001
AP vs. no intervention	2	−19.10 [−21.06, −17.14]	28	P=0.24

AP: auricular acupressure; AHDs: antihypertensive drugs.