0777 VALIDATION OF THE SLEEP-WAKE SCORING OF A NEW WRIST WORN ALERTNESS MONITORING DEVICE
Abstract Introduction: The MyCadian (MC) is a wrist-worn device designed to monitor alertness. The current study was designed to test the reliability of MC sleep-wake scoring. Methods: Participants were 27 adult, good sleepers who underwent one night of polysomnography (PSG) while wearing MC and the...
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Veröffentlicht in: | Sleep (New York, N.Y.) N.Y.), 2017-04, Vol.40 (suppl_1), p.A288-A288 |
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Zusammenfassung: | Abstract
Introduction:
The MyCadian (MC) is a wrist-worn device designed to monitor alertness. The current study was designed to test the reliability of MC sleep-wake scoring.
Methods:
Participants were 27 adult, good sleepers who underwent one night of polysomnography (PSG) while wearing MC and the validated Actiwatch 2 (AW; Phillips Respironics) on their nondominant wrist. PSGs were manually stage scored. All data were rendered in binary fashion (0=wake, 1=sleep) for each 30 second epoch. After excluding missing data (n=3 missing AW, n=2 missing MC, n=2 with partial night MC), 20 participants had full night data on all three devices with 17,734 total epochs. With PSG as the gold standard, pooled epoch-by-epoch agreement for sleep vs. wake was calculated for MC and for AW using percent agreement and Cohen’s kappa statistic. Positive predictive values for PSG scored sleep epochs and PSG scored wake epochs as well as sleep continuity statistics were calculated.
Results:
Percent agreement with PSG scored epochs of wake and sleep was 91.3% for MC and 87.7% for AW. The kappa statistic was 0.67 for MC and 0.50 for AW. Positive predictive values for sleep stages were 94.4% and 90.8% for MC and AW, respectively, and 74.5% and 65.6% for wake stages. Both devices tended to underscore wake and overscore sleep epochs compared to PSG. Descriptively, compared to PSG, sleep latency was higher with MC and wake after sleep onset higher with AW. Total sleep time and sleep efficiency were somewhat more similar across devices.
Conclusion:
Reliability of MC compared to PSG scoring was similar to or slightly more favorable than reliability of AW. The 0.67 kappa statistic for MC is consistent with a high level of agreement with PSG. Findings suggest that MC provides reliable sleep-wake scoring during a nocturnal sleep period for good sleepers.
Support (If Any):
CurAegis Technologies provided the test device and the actigraphy units to the study free of charge for the duration of the study. Disclaimer: The authors’ views or opinions do not necessarily represent those of the Department of Veterans Affairs or the United States Government. |
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ISSN: | 0161-8105 1550-9109 |
DOI: | 10.1093/sleepj/zsx050.776 |