Effectiveness of a smartphone application on medication adherence in children with short stature receiving GH therapy: A multicenter prospective cohort study (GTL-App)

This multicenter prospective cohort study followed up Japanese children who had just started GH therapy using a drug delivery device (GROWJECTOR® L) linked to a newly developed smartphone application and analyzed precise medication adherence data stored in GROWJECTOR® L to evaluate the usefulness of the application in improving GH therapy adherence over a 24-wk observation period. Moreover, a questionnaire survey on GH therapy and the smartphone application was conducted, and factors affecting adherence to GH therapy were assessed. This study enrolled 60 children with short stature who had GH deficiency or Turner syndrome or were small for gestational age from 28 Japanese medical institutions and analyzed 57 of them. The median and mean adherence rates after 24 wk of observation were 96% and 93%, respectively. Although adherence rates were significantly lower from wk 16 to wk 20 than from wk 1 to wk 4, cumulative adherence rates remained high throughout the observation period. The questionnaire analysis revealed that most patients actively used the application. Overall, our results suggest that active discussion regarding the development of healthcare systems that contribute toward improving the patient quality of life is warranted.