Table 2.
Sleep Stage Summary Agreement
| Stage | Device | n | Device Mean (SD) | Reference Mean (SD) |
|---|---|---|---|---|
| Light | Fitbit Inspire HR | 106 | 243.5 (53.0) | 189.4 (54.3) |
| Oura Ring | 111 | 210.8 (66.0) | 189.0 (53.9) | |
| Polar Vantage V Titan | 103 | 226.1 (90.5) | 190.7 (52.9) | |
| Deep | Fitbit Inspire HR | 106 | 70.1 (21.9) | 80.1 (29.3) |
| Oura Ring | 111 | 124.1 (41.7) | 81.4 (29.2) | |
| Polar Vantage V Titan | 103 | 104.5 (92.1) | 82.8 (28.6) | |
| REM | Fitbit Inspire HR | 106 | 92.8 (30.2) | 137.2 (54.8) |
| Oura Ring | 111 | 77.5 (34.8) | 132.7 (52.6) | |
| Polar Vantage V Titan | 103 | 87.8 (40.7) | 138.2 (54.4) |
Notes: Sleep stage summary agreement between devices and reference. The Dreem headband served as reference for all sleep stage outcomes. Results are shown for all devices that output sleep stage classifications. See Table 1 notes for additional table details.
Abbreviations: REM, rapid eye movement; SD, standard deviation.