Table 2.
Sensitivity: mean and standard deviation of epochs assigned to each sleep stage by each wearable and PSG. Sensitivity was calculated as true positive/(true positive + false negative).
| Oura Assignment | PSG Assignment | |||
|---|---|---|---|---|
| Wake | Light | Deep | REM | |
| Wake | 68.6% (18.4%) | 7.4% (4.6%) |
0.1% (0.2%) |
5.8% (7.3%) |
| Light | 19.0% (11.6%) |
78.2% (7.6%) |
19.9% (14.1%) |
17.8% (13.1%) |
| Deep | 2.6% (3.6%) |
8.5% (6.5%) |
79.5% (14.5%) |
0.4% (0.9%) |
| REM | 9.7% (10.9%) |
6.0% (5.0%) |
0.5% (1.6%) |
76.0% (15.2%) |
| Fitbit Assignment | Wake | Light | Deep | REM |
| Wake | 67.7% (23.1%) |
6.8% (4.2%) |
1.5% (1.6%) |
6.1% (4.5%) |
| Light | 23.3% (18.8%) |
78.0% (9.0%) |
34.8% (20.4%) |
24.5% (20.9%) |
| Deep | 0.8% (2.9%) |
7.5% (5.8%) |
61.7% (21.1%) |
1.8% (5.3%) |
| REM | 8.2% (15.3%) |
7.7% (6.6%) |
2.1% (6.9%) |
67.6% (23.3%) |
| Apple Assignment | Wake | Light | Deep | REM |
| Wake | 52.4% (21.5%) |
4.2% (3.5%) |
0.3% (0.7%) |
1.4% (2.0%) |
| Light | 37.2% (18.2%) |
86.1% (6.2%) |
48.3% (20.0%) |
15.8% (14.4%) |
| Deep | 1.0% (1.9%) |
2.1% (3.2%) |
50.5% (20.6%) |
0.2% (1.1%) |
| REM | 9.4% (12.8%) |
7.6% (4.7%) |
0.9% (2.0%) |
82.6% (14.8%) |
Note: Sensitivity for each cell was calculated at the participant level. Mean and standard deviation of participant-level estimates are presented. Estimates represent 35 participants for Oura, 33 participants for Fitbit, and 29 participants for Apple.