TABLE 4.

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

Variables	Number of comparisons	WMD (95% CI)	p	p for interaction
Intervention duration
3 months	3	−4.66 (−6.61 to −2.71)	<.001	.05
6 months	7	−2.36 (−3.53 to −1.20)	<.001
12 months	7	−2.07 (−3.39 to −0.75)	.002
18 months	2	−4.61 (−6.74 to −2.47)	<.001
Type of intervention device
Text messages/e‐mail	4	−4.04 (−5.66 to −2.43)	<.001	.08
Smartphone app	3	−2.10 (−4.65 to 0.45)	.11
Website	2	−1.30 (−2.86 to 0.27)	.10
Electronic monitor	2	−1.56 (−3.27 to 0.14)	.07
Pharmacist/clinician guided medication
Yes	9	−2.59 (−3.99 to −1.18)	<.001	.74
No	2	−2.02 (−5.01 to 0.97)	.11

Abbreviations: CI, confidence interval; DBP, diastolic blood pressure; WMD, weighted mean difference.