Table 2.
Performance of ear-EEG in correctly detecting N2/N3 sleep (stages N2 and N3) from wake and light sleep (W/N1) in scenario 1, and sleep (stages N1, N2, and N3) from wake in scenario 2, using scalp electrodes as the gold standard
| Scenario 1 | N2/N3 [scalp] | N2/N3 [ear] | TP | Sen | Spc | Acc |
|---|---|---|---|---|---|---|
| 1 | 17 (18.9%) | 9 (10.0%) | 9 | 0.53 | 1.00 | 0.91 |
| 2 | 66 (73.3%) | 59 (65.6%) | 55 | 0.83 | 0.83 | 0.83 |
| 3 | 81 (90.0%) | 78 (86.7%) | 78 | 0.96 | 1.00 | 0.97 |
| 4 | 36 (40.0%) | 65 (72.7%) | 33 | 0.92 | 0.41 | 0.61 |
| all | 200 (55.6%) | 211 (58.6%) | 175 | 0.88 | 0.78 | 0.83 |
| Scenario 2 | Sleep [scalp] | Sleep [ear] | TP | Sen | Spc | Acc |
|---|---|---|---|---|---|---|
| 1 | 30 (33.3%) | 14 (15.6%) | 14 | 0.47 | 1.00 | 0.82 |
| 2 | 76 (84.4%) | 75 (83.3%) | 70 | 0.92 | 0.64 | 0.88 |
| 3 | 82 (91.1%) | 89 (98.9%) | 82 | 1.00 | 0.13 | 0.92 |
| 4 | 66 (73.3%) | 90 (100%) | 66 | 1.00 | 0.00 | 0.73 |
| all | 254 (70.6%) | 268 (74.4%) | 232 | 0.91 | 0.66 | 0.84 |
Definition of abbreviations: Acc = accuracy; Sen = sensitivity; Spc = specificity; TP = true positive.
N2/N3 [scalp] denotes the number of N2 and N3 epochs defined by scalp-EEG scores in Scenario 1, N2/N3 [ear] number of N2 and N3 epochs defined by ear-EEG scores in Scenario 1, Sleep [scalp] denotes the number of sleep epochs defined by scalp-EEG scores in Scenario 2, Sleep [ear] number of sleep epochs defined by ear-EEG scores in Scenario 2.