Table 1.
Condition characteristics.
| Age | Start of Light Exposure Relative to Melatonin Midpointa | |||
|---|---|---|---|---|
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|
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| Condition (Light; Phase of Cortisol Profile) | Participants (n) | Mean ± SD (y) | Mean ± SD (h) | Range (h) |
| Bright light, rising phase | 8 | 23.5 ± 4.3 | −1.9 ± 1.1 | −3.0 to 0.3 |
| Bright light, descending phase | 5 | 29.0 ± 8.9 | 3.2 ± 1.7 | 1.5 to 5.7 |
| Dim light, rising phase | 7 | 24.7 ± 6.1 | −1.9 ± 1.4 | −3.4 to 0.0 |
a
A negative number represents timing of light exposure onset prior to the melatonin midpoint in hours, determined 24 h earlier. A positive number represents timing of light exposure onset after the melatonin midpoint in hours.