Table 4.
Psychomotor vigilance task performance by Epworth sleepiness score categories
| PVT variables | ESS categories
|
P-value | |
|---|---|---|---|
| ≤9 n=25 |
<9 n=36 |
||
| RT (ms)* | 260 (27) | 283.4 (48) | 0.04 |
| Fastest 10% RT (ms)* | 198 (20) | 204 (25) | 0.27 |
| Slowest 10% RT (ms)* | 396 (100) | 485 (181) | 0.03 |
| I/slowest 10% RT (ms)* | 2.8 (0.42) | 2.4 (0.57) | 0.01 |
| I/RT (ms)* | 4.03 (0.41) | 3.8 (0.55) | 0.11 |
| Lapses (RT >500 ms)** | 0.6 (0.73) | 1.2 (1.0) | 0.03 |
| False start (RT <100 ms)** | 0.86 (1.1) | 1 (1.1) | 0.62 |
Notes:
*
Log transformed;
**
square root transformed; PVT variables represent back transformation after log/square root transformation; Bold P-values represent statistical significance. All PVT variable data is presented as mean (SD).
Abbreviations: ESS, Epworth sleepiness scale; I/RT, reciprocal response time; I/slowest, reciprocal of slowest response time; ms, milliseconds; PVT, psychomotor vigilance task; RT, reaction time; SD, standard deviation.