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Table 3 DLMOs in the four conditions (n = 8)

From: Can tryptophan supplement intake at breakfast enhance melatonin secretion at night?

  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
  1. 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)
  2. DLMO dim light melatonin onset
  3. aA positive value for Δ means that the DLMO on the second day had advanced from its value on the first day