Table 1.
Daytime (10:00–15:00) and nighttime (22:00–03:00) plasma melatonin concentrations (least square means ± s.e.m.). (N = 82)
| Day | Night | P-value | |
| Melatonin (pg/ml) | 2.7 ± 0.8 | 14.4 ± 0.8 | p < 0.001 |
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