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Apple Watch S6

Compared to PSG-derived

sleep:

Sensitivity for sleep: 97%

Specificity for wake: 26%

Sleep Agreement: 88%

Compared to ECG-derived

heart rate:

Absolute difference: 1.5 bpm

Correlation: 0.96

Compared to ECG-derived

heart rate variability:

Absolute difference: 22.5ms

Correlation: 0.67