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Researchers turned some 23,000 hours of data from wristbands worn by 215 people into a digital measure of stroke recovery, using just one day of at-home recording. The measure tracked improvement in line with clinical assessments, with a margin of error 52 to 58% lower, and detected differences between patients and healthy people even when patients had reached the clinical assessment’s highest score. The team estimated that clinical trials using the measure could need more than 60% fewer patients to produce reliable results.
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