First, the heartbeat interval data RR (in red) shows a decreasing trend for recovery cases than an increasing trend for other stages.
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When Patients Recover From COVID-19: Data-Driven Insights From Wearable Technologies.
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The sentences
The curve of patients in mild stage also decreases at the beginning, while gradually stabilized after the curve rose and then again has a decreasing trend at about 12 to 14 days.
We observe that there are fluctuating HRV patterns in severe patients, but a more stable pattern and a clear trend in mild patients or recovering patients.