Table 1. Metrics of PVT performance relative to time of day and circadian phase.
Upper panel: Statistical analysis results with the factors day, time of day/circadian phase, and interaction. Lower panel: Individual time-point differences for each PVT metric. Refer to Figure 3 for a graphical display of the results. PVT: psychomotor vigilance task; RT: reaction time. Degrees of freedom for time-of-day analyses: day 1, 134; time of day 7, 134; day × time of day 7, 134; for circadian analyses: day 1, 126; circadian phase 11, 126; day × circadian phase 11, 126.
| Metric & Factor: | Time of Day:
|
Circadian Phase:
|
||
|---|---|---|---|---|
| F-value: | P-value: | F-value: | P-value: | |
| Mean RT | ||||
| Day | 0.49 | 0.486 | 0.45 | 0.502 |
| Time/Phase | 6.10 | <0.001 | 3.93 | <0.001 |
| Day × Time/Phase | 1.48 | 0.182 | 0.96 | 0.491 |
| Median RT | ||||
| Day | 0.00 | 0.953 | 0.00 | 0.977 |
| Time/Phase | 7.43 | <0.001 | 3.63 | <0.001 |
| Day × Time/Phase | 1.29 | 0.262 | 1.07 | 0.395 |
| 10% Fastest RT | ||||
| Day | 1.40 | 0.243 | 0.90 | 0.349 |
| Time/Phase | 4.79 | <0.001 | 3.36 | <0.001 |
| Day × Time/Phase | 0.87 | 0.532 | 0.80 | 0.645 |
| 10% Slowest 1/RT | ||||
| Day | 1.00 | 0.319 | 1.04 | 0.311 |
| Time/Phase | 3.80 | <0.001 | 2.56 | 0.006 |
| Day × Time/Phase | 1.46 | 0.187 | 1.10 | 0.370 |
| Metric: | Time of Day: | Circadian Phase: |
|---|---|---|
| Mean RT | 05:00 < 11:00–23:00 h | 0° < 120–240°, 300°; 30° < 210° |
| Median RT | 05:00 < 11:00–23:00 h | 0° < 120, 180°, 210°, 270°; 30° < 180° |
| 10% Fastest RT | 2:00 < 20:00 h; 5:00 < 14:00–20:00 h | 0° < 120°, 180–270° |
| 10% Slowest 1/RT | 5:00 < 14:00, 17:00, 23:00 h | 0° < 120°, 210° |