Table I.
Comparison of Psycho‐Behavioral Variables Between Subjects who Crossed and Did Not Cross the Melatonin Threshold at 22:00 h
| Bond‐Lader parameter | Mean + SD cm at 22:00 h | P (t‐test) | |
|---|---|---|---|
| Below threshold melatonin levels N = 6 | Above threshold melatonin levels N = 8 | ||
| Sleepy–alert | 6.2 + 2.1 | 5.8 + 2 | 0.7 |
| Excited–calm | 8 + 1.3 | 7.5 + 1.3 | 0.04 |
| Weak–vigor | 7.7 + 1.3 | 6.5 + 1.5 | 0.2 |
| Lucid–confused | 0.9 + 1.2 | 2.5 + 3 | 0.2 |
| Clumsy–well coordinated | 6.2 + 2.2 | 7.9 + 2.5 | 0.2 |
| Energetic–fatigue | 2.7 + 1.7 | 6 + 1.8 | 0.005 |
| Satisfied–dissatisfied | 8.2 + 1.8 | 6.8 + 2.5 | 0.3 |
| Calm–worried | 1.5 + 1.6 | 1.6 + 1.4 | 0.9 |
| Quick thinking–slow thinking | 2.1 + 1.9 | 2 + 1.7 | 0.9 |
| Relaxed–tense | 3.2 + 2 | 2.2 + 2.2 | 0.4 |
| Dreamy–concentrated | 7.9 + 0.9 | 7.5 + 0.5 | 0.4 |
| Very efficient–inefficient | 2.7 + 1.4 | 2 + 1.2 | 0.3 |
| Sad–happy | 7.2 + 2 | 7.2 + 2 | 1 |
| Friendly–hostile | 1 + 1.3 | 0.7 + 0.8 | 0.7 |
| Bored–interested | 8 + 1 | 7.9 + 1.7 | 0.9 |
| Sociable–reclusive | 1.7 + 1.6 | 2.4 + 3 | 0.6 |