The system was trained using nearly 500,000 hours of smartwatch data collected from 2,109 people, with additional testing and training in several cohorts.
The approach was then validated in 196 participants by comparing the smartwatch-estimated presence of hypertension and standard office blood pressure measurements, evaluated against reference 24-hour ambulatory blood pressure monitoring, the gold-standard clinical monitoring method.
Detection of hypertension was comparable between the smartwatch system and standard office measurements.
The smartwatch correctly identified slightly more cases of hypertension than office-based cuffed monitoring, with sensitivities of 65.8% and 55.3%, respectively, but the differences were not statistically significant.
Both methods had equal specificities (successfully avoiding false positives 90% of the time).
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