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JMIR Mhealth Uhealth. 2017 Nov 29;5(11):e179. doi: 10.2196/mhealth.8781.

One Drop | Mobile on iPhone and Apple Watch: An Evaluation of HbA1c Improvement Associated With Tracking Self-Care.

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Informed Data Systems Inc, New York, NY, United States.
Leiden University, Leiden, Netherlands.
The University of Arizona Health Sciences, Tucson, AZ, United States.
Biomedical Informatics Consultants LLC, Potomac, MD, United States.
Informed Data Systems Inc, Austin, TX, United States.



The One Drop | Mobile app supports manual and passive (via HealthKit and One Drop's glucose meter) tracking of self-care and glycated hemoglobin A1c (HbA1c).


We assessed the HbA1c change of a sample of people with type 1 diabetes (T1D) or type 2 diabetes (T2D) using the One Drop | Mobile app on iPhone and Apple Watch, and tested relationships between self-care tracking with the app and HbA1c change.


In June 2017, we identified people with diabetes using the One Drop | Mobile app on iPhone and Apple Watch who entered two HbA1c measurements in the app 60 to 365 days apart. We assessed the relationship between using the app and HbA1c change.


Users had T1D (n=65) or T2D (n=191), were 22.7% (58/219) female, with diabetes for a mean 8.34 (SD 8.79) years, and tracked a mean 2176.35 (SD 3430.23) self-care activities between HbA1c entries. There was a significant 1.36% or 14.9 mmol/mol HbA1c reduction (F=62.60, P<.001) from the first (8.72%, 71.8 mmol/mol) to second HbA1c (7.36%, 56.9 mmol/mol) measurement. Tracking carbohydrates was independently associated with greater HbA1c improvement (all P<.01).


Using One Drop | Mobile on iPhone and Apple Watch may favorably impact glycemic control.


HbA1c; glycated hemoglobin A1c; glycemic control; mobile health; mobile phone; self-care behavior; smartwatch; type 1 diabetes; type 2 diabetes

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