Accuracy and precision of smartwatch for patient monitoring in Out-of-Hospital environment

Background: Smart watches are already capable of monitoring vital signs such as heart rate and oxygen saturation, however their numerical results can often confuse lay patients, especially the elderly. What would the accuracy results look like if the results were presented in a binary system of normal and abnormal? Aim: Evaluate the accuracy, precision and recall of the results obtained from the perspective of a lay patient. Methods: A single-centre prospective study was carried out, following 80 volunteers in a clinical trial 24 weeks each, accuracy and precision of the equipment under out-of-hospital conditions were evaluated to simulate remote home monitoring. Results: In 35 weeks of clinical study, heartbeat and oxygen saturation was collected from smartwatch and gold standard device simultaneously for 80 volunteers to determine accuracy and precision. Those data were evaluated from the perspective of normal and abnormal and presents a accuracy, precision and recall of 97%, 99% and 97% respectively for heart rate, and 77%, 94% and 81% respectively for oxygen saturation. Conclusion: Based on the results obtained, considering a home environment for layman use, the smartwatch used in this study can provide high accuracy, precision and recall for heart rate and oxygen saturation.