Table 3.
DLMOs in the four conditions (n = 8)
| Day 1 DLMO (h:min) | Day 2 DLMO (h:min) | p value | t value | dz value | Δ DLMOa (min) | |
|---|---|---|---|---|---|---|
| TRP*Bright | 22:51 ± 0:11 | 21:53 ± 0:17 | .001 | 5.12 | 1.81 | +58.5 ± 11.4 |
| Placebo*Bright | 22:26 ± 0:12 | 21:40 ± 0:15 | .002 | 4.89 | 1.73 | +46.6 ± 9.5 |
| TRP*Dim | 22:01 ± 0:09 | 22:24 ± 0:14 | .050 | 2.37 | 0.84 | −22.7 ± 9.6 |
| Placebo*Dim | 22:21 ± 0:12 | 22:35 ± 0:17 | .118 | 1.78 | 0.63 | −13.8 ± 7.8 |
A DLMO was not detected for four subjects during the sampling period; therefore, their data were excluded from this analysis. All data are shown as the mean ± standard error of the mean. Times for day 1 DLMO and day 2 DLMO are presented as clock time (h:min). Δ DLMO = change in DLMO (min)
DLMO dim light melatonin onset
aA positive value for Δ means that the DLMO on the second day had advanced from its value on the first day