Table 3.
Psychomotor vigilance task performance by the apnea hypopnea index categories
| PVT variables | AHI categories
|
P-value | |||
|---|---|---|---|---|---|
| <5/hr n=18 |
5–15/hr n=19 |
15–30/hr n=10 |
>30 n=14 |
||
| RT (ms)* | 283 (37) | 265 (47) | 286 (49) | 265 (34) | 0.37 |
| Fastest 10% RT (ms)* | 209 (21) | 194 (25) | 209 (24) | 200 (23) | 0.18 |
| Slowest 10% RT (ms)* | 451 (164) | 453 (182) | 492 (184) | 407 (88) | 0.64 |
| I/slowest 10% RT (ms)* | 2.5 (0.45) | 2.6 (0.61) | 2.4 (0.69) | 2.6 (0.41) | 0.70 |
| I/RT (ms)* | 3.7 (0.42) | 4.1 (0.59) | 3.8 (0.54) | 3.9 (0.42) | 0.17 |
| Lapses (RT >500 ms)** | 0.9 (0.92) | 0.97 (0.91) | 1.4 (1.1) | 0.68 (0.81) | 0.34 |
| False start (RT <100 ms)** | 0.9 (1.3) | 0.93 (1.0) | 0.59 (1.0) | 1.3 (1.1) | 0.48 |
Notes:
*
Log transformed;
**
square root transformed; PVT variables represent back transformation after log/square root transformation. All PVT variable data is presented as mean (SD).
Abbreviations: AHI, apnea hypopnea index; I/RT, reciprocal response time; I/slowest, reciprocal of slowest response time; ms, milliseconds; PVT, psychomotor vigilance task; RT, reaction time; SD, standard deviation.