Table 1.
Demographic, clinical, and instrumental features at study entry
| Variable | Awareness (number = 24) | Unawareness (number = 32) | Total (number = 56) | t/ χ 2 | P |
|---|---|---|---|---|---|
| Age, years, mean ± SD | 41.17 ± 15.9 | 39.66 ± 15.8 | 40.30 ± 15.6 | 0.353 | 0.726 |
| Female/male | 6/18 | 9/23 | 15/41 | 0.069 | 0.793 |
| Time post onset, weeks, mean ± SD | 6.08 ± 2.5 | 5.97 ± 2.0 | 6.02 ± 2.2 | 0.192 | 0.849 |
| Type of BI, trauma/nontrauma | 15/9 | 8/24 | 23/33 | 8.093 | 0.004 |
| NSE (μg/L), <33/≥33 | 19/5 | 18/14 | 37/19 | 3.319 | 0.068 |
| Pupillary light reflex, yes/no | 23/1 | 31/1 | 54/2 | 0.043 | 0.836 |
| Corneal reflex, yes/no | 23/1 | 29/3 | 52/4 | 0.594 | 0.441 |
| Motor response, flexor/extensor or absent | 21/3 | 17/15 | 39/17 | 8.008 | 0.005 |
| EEG reactivity, present/absent | 16/8 | 8/24 | 26/30 | 9.944 | 0.002 |
| Sleep spindles, present/absent | 17/7 | 7/25 | 24/32 | 13.891 | 0.0002 |
| N20, present/absent | 15/9 | 8/24 | 23/33 | 8.0935 | 0.004 |
BI, brain injury; NSE, neuron specific enolase; EEG, electroencephalogram.