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A Bluetooth-Based Smartphone App for Detecting Peer Proximity: Protocol for Evaluating Functionality and Validity

A Bluetooth-Based Smartphone App for Detecting Peer Proximity: Protocol for Evaluating Functionality and Validity

A transient encounter is recorded when the BLE proximity detection service integrated into our EMA app detects a beacon, defined as detecting a signal from a peer beacon that is at least as strong as the Received Signal Strength Indication criteria that correspond to our proximity criterion (ie, 15 ft, 4.6 m).

Nancy P Barnett, Alexander W Sokolovsky, Matthew K Meisel, Shannon R Forkus, Kristina M Jackson

JMIR Res Protoc 2024;13:e50241

Diagnostic Accuracy of Single-Lead Electrocardiograms Using the Kardia Mobile App and the Apple Watch 4: Validation Study

Diagnostic Accuracy of Single-Lead Electrocardiograms Using the Kardia Mobile App and the Apple Watch 4: Validation Study

Lo A: limit of agreement; Lo E: line of equality; M: mean. The Bland-Altman plot for the QTc F interval comparing the Kardia Mobile and Custo Cardio graphically showed an obvious deviation, although nearly all values are within the Lo As (Figure 6). The average difference of the QTc F intervals of the ECGs was mean 39.0 (SD 15.3) ms, which is above the Lo E. Again, the bias can be considered significant as the Lo E is outside the CI of the mean difference.

Kristina Klier, Lucas Koch, Lisa Graf, Timo Schinköthe, Annette Schmidt

JMIR Cardio 2023;7:e50701

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