Positive influence of short message service and voice call interventions on adherence and health outcomes in case of chronic disease care: a systematic review

Table 3 Key findings in the clinical area of Asthma and Hypertension

Lead Author/Year	Country	Study design	Sample size	Duration	Age group	Clinical area	Intervention	Delivery frequency	Measures of outcome	Results Control (C) versus intervention (I)
Ulla Strandbygaard/2010 [35]	Denmark	RCT	22	3 months	18–45	Asthma	SMS	Daily	Adherence to asthma treatment, lung function tests	Mean adherence rate
Ulla Strandbygaard/2010 [35]	Denmark	RCT	22	3 months	18–45	Asthma	SMS	Daily	Adherence to asthma treatment, lung function tests	I: 77.9 to 81.5 %; C: 84.2 to 70.1 %.
Keith J. Petrie/2011 [31]	New Zealand	RCT	147	4.5 months	16–45	Asthma	SMS	2 SMS/day for first 1–6 weeks, 1 SMS/day for next 7 – 12 weeks, and 3 SMS/ week for rest 13 – 18 weeks	Self-reported adherence, adherence to treatment	Self-reported adherence over all time points
										C: 43.2 %
										I: 57.8 %
										Percentage taking over 80 % of prescribed inhaler doses
										C: 23.9 %
										I: 37.7 %
E. Márquez Contreras/2004 [5]	Spain	RCT	67	6 months	18+	HTN	SMS	2 SMS / week	Adherence to drug, blood pressure measurement	Mean percentage adherence
										I: 91.1 ± 23.1 to 95.0 ± 10.4
										C: 86.2 ± 26.6 to 86.1 ± 23.4
										% of controlled hypertension at end of study-
										C: 51.5 %; I: 64.7 %.

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