Table 2.
Univariate analysis
| Characteristic | Awakening (n = 48) | Non-awakening (n = 58) | p value |
|---|---|---|---|
| Age | 52.06 ± 22.05 | 49.88 ± 20.27 | 0.597 |
| Gender | 0.665 | ||
| Male | 33 | 43 | |
| Female | 15 | 15 | |
| Time from coma onset to EEG record, days, (median, IQR) | 7 (4–16) | 8 (4–20) | 0.593 |
| Pupillary light reflex | 0.086 | ||
| Present | 45 | 48 | |
| Absent | 3 | 10 | |
| Etiology | 0.149 | ||
| Anoxia | 4 | 10 | |
| Trauma | 8 | 5 | |
| Encephalitis | 8 | 17 | |
| Stroke | 28 | 23 | |
| Poisoning | 1 | 2 | |
| GCS score, mean ± SD | 6.29 ± 1.53 | 4.79 ± 1.34 | <0.0001 |
| EEG-R | <0.0001 | ||
| Present | 41 | 15 | |
| Absent | 7 | 43 | |
| Sleep spindles | <0.0001 | ||
| Present | 41 | 18 | |
| Absent | 7 | 40 | |
| EEG-awakening | <0.0001 | ||
| Yes | 40 | 9 | |
| No | 8 | 49 | |
CPC Glasgow–Pittsburgh cerebral performance categories, SD standard deviation, GCS Glasgow coma scale, EEG electroencephalogram, EEG-R electroencephalogram reactivity