To the Editor In a recent issue of JAMA Internal Medicine, Dr Plante and colleagues reported on the accuracy of the Instant Blood Pressure (IBP) app.1 We identified misrepresentations and deficiencies in how the study and its analysis were conducted. Here we present our observations for consideration.
The authors failed to disclose that approximately 20% of their data were associated with reference blood pressures outside IBP’s supported measurement range. As published on the website2 (data not peer reviewed) and App Store description prior to the start of the authors’ data collection, IBP will not produce estimates outside of its supported range (systolic, 102-158 mm Hg; diastolic, 65-99 mm Hg). We believe the authors’ failure to disclose or mention IBP’s supported range misled readers.
Archdeacon R, Schneider R, Jiang Y. Critical Flaws in the Validation of the Instant Blood Pressure Smartphone App—A Letter From the App Developers. JAMA Intern Med. 2016;176(9):1410. doi:10.1001/jamainternmed.2016.4753