TABLE 3.

Subgroup analysis of the effect of mHealth intervention on SBP reduction.

Variables	Number of comparisons	WMD (95% CI)	p	p for interaction
Intervention duration
3 months	4	−6.75 (−12.64 to −0.86)	.020	.15
6 months	7	−4.74 (−6.53 to −2.95)	<.001
12 months	8	−4.16 (−5.72 to −2.60)	<.001
18 months	2	−6.60 (−8.15 to −5.05)	<.001
Type of intervention device
Text message/e‐mail	5	−4.66 (−7.16 to −2.15)	<.001	.84
Smartphone app	4	−5.22 (−8.24 to −2.20)	<.001
Website	2	−4.38 (−7.94 to −0.83)	.020
Electronic monitor	2	−3.04 (−6.77 to −0.70)	.110
Pharmacist/clinician guided medication
Yes	10	−4.91 (−6.59 to −3.22)	<.001	.16
No	3	−2.58 (−5.32 to −0.15)	.060

Abbreviations: CI, confidence interval; SBP, systolic blood pressure; WMD, weighted mean difference.