Figure 1
The schedules of the interventions.
Table 1
Illumination value (Lux) of all subjects in the third group (G3)
| Max | Min. | Ave | Max | Min | Ave | Max | Min | Ave | Max | Min | Ave | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| T | 31 | 30 | 30 | 207 | 193 | 202 | 65 | 58 | 61 | 29 | 23 | 29 |
The surface of illumination meter sensor was put vertically just in front of eyes of participants who are standing* or sitting# and illumination value was measured.
Table 2
Estimates of the extent to which subjects in groups G2 and G3 carried out the intervention
| Question: On a scale of 0 to 100, how would you estimate your confidence in your response? The question is “To what extent did you carry out this intervention program during this one month intervention period? | |
|---|---|
| 4. Estimate for “exposure to low color temperature light emitted from incandescent bulbs at night". (G3) | score /100 |
Figure 2
Positive correlation between hours when subjects were exposed to incandescent light at night and the index of feeling of sleeping well in Last Week Period. Upper and lower lines of linear regression line show 95% confidence estimate.
Figure 3
Comparison of salivary melatonin concentration among the three groups. Group 1: no intervention; Group 2: Recommendation of high protein breakfast and exposure to sunlight; Group 3: Same as Group 2 plus the recommendation of exposure to low color temperature light emitted from an incandescent light bulb. A: Melatonin level in the saliva collected on the day just before the intervention (Kruskal Wallis test: χ2-value = 0.92, df = 2, p = 0.63); B: Melatonin in the saliva collected at the mid-point and on the day before the last day of the intervention (Bonferroni multiple comparison test: G1 versus G3, p = 0.018; G2 versus G3, p = 0.011).
Figure 4
Comparison of melatonin level between “high implementation group” and “low implementation group” of G3 participants. See the text for details.
Figure 5
Comparison of how many days students followed the recommendations during the 30-day-long intervention between two groups in the first week period (FWP), medium period of 2 weeks (MP) and the last week period (LWP).
Figure 6
Positive correlation between M-E scores and the index of satisfaction on the implementation of the intervention on breakfast with high protein foods. Upper and lower lines of linear regression line show 95% confidence estimate.
Figure 7
Comparison of the anger/irritation index before and after the intervention.