Table 1.
Salivary melatonin onset time, melatonin suppression, and 24 hr daylight in the three study conditions
| DLa | OLEDb | LEDc | p | Post hoc analysis | |
|---|---|---|---|---|---|
| Melatonin onset time | 21:24±01:02 | 21:49±01:04 | 21:45±01:00 | 0.011 | a<b, c |
| Melatonin onset delay, min | N/A | 25.3±26.8 | 20.6±37.9 | 0.643 | |
| AUC, pg/mL×h | 39.2±39.1 | 28.6±30.7 | 28.4±33.2 | 0.018 | a>b, c |
| Melatonin suppression, % | N/A | 18.2±52.6 | 24.8±38.1 | 0.458 | |
| Mean melatonin level at 24:00, pg/mL | 22.4±17.5 | 17.8±14.7 | 15.8±15.3 | 0.006 | a>c |
Data are mean±standard-deviation values. Analyzed by Friedman test. DL: dim light, LE: light exposure, OLED: organic light-emitting diode, LED: light-emitting diode, AUC: area under the time-melatonin concentration curve