Table 1.
Melatonin levels and amount of suppression to 3 hr of 500-lux light presented during the test night at the end of the bright light week and at the end of the dim light week
| Subject | Bright week
|
Dim week
|
Difference between suppression scoresd | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Baseline night
|
Test night
|
Suppression scorec (%) | Baseline night
|
Test night
|
Suppression scorec (%) | ||||||
| Prea | Postb | Prea | Postb | Prea | Postb | Prea | Postb | ||||
| C08e | 3.3 | 6.9 | 3.5 | 3.4 | 50.7 | 1.4 | 7.3 | 2.3 | 2.1 | 71.2 | 20.5 |
| C09 | 3.1 | 4.9 | 3.7 | 2.2 | 55.1 | 3.2 | 4.9 | 3.2 | 1.1 | 77.6 | 22.5 |
| C10e | 9.4 | 7.7 | 6.9 | 3.8 | 50.6 | 9.6 | 8.0 | 8.6 | 2.0 | 75.0 | 24.4 |
| C11 | 10.4 | 16.6 | 5.5 | 4.3 | 74.1 | 8.1 | 11.7 | 6.1 | 3.6 | 69.2 | −4.9 |
| C13e | 12.9 | 10.8 | 14.8 | 8.7 | 19.4 | 8.2 | 12.0 | 11.0 | 7.0 | 41.7 | 22.3 |
| C14 | 9.2 | 11.2 | 6.9 | 4.7 | 58.0 | 6.9 | 16.8 | 8.1 | 10.8 | 35.7 | −22.3 |
| C19 | 16.6 | 15.6 | 12.7 | 18.4 | −17.9 | 8.9 | 15.2 | 7.9 | 19.2 | −26.3 | −8.4 |
| C21 | 11.0 | 20.3 | 6.7 | 11.9 | 41.4 | 1.6 | 21.5 | 2.9 | 11.5 | 46.5 | 5.1 |
| C25e | 8.5 | 14.7 | 6.0 | 10.0 | 32.0 | 4.0 | 7.7 | 4.9 | 3.7 | 51.9 | 19.9 |
| C26 | 2.3 | 6.6 | 3.5 | 4.6 | 30.3 | 3.0 | 6.7 | 4.4 | 2.0 | 70.1 | 39.8 |
| C27 | 19.7 | 17.3 | 19.9 | 13.2 | 23.7 | 16.2 | 18.9 | 19.5 | 13.2 | 30.2 | 6.5 |
| C28e | 6.6 | 7.3 | 5.6 | 1.8 | 75.3 | 5.0 | 5.0 | 3.6 | 0.5 | 90.0 | 14.7 |
| Mean | 9.4 | 11.7 | 8.0 | 7.3 | 41.1 | 6.3 | 11.3 | 6.9 | 6.4 | 52.7* | 11.7 |
| S.D. | 5.3 | 5.1 | 5.1 | 5.2 | 25.9 | 4.2 | 5.6 | 4.8 | 6.0 | 31.1 | 17.2 |
*
P < 0.05 compared with bright week by paired t-test.
a
Mean pg/mL for 2 hr before light exposure time.
b
Mean pg/mL for last 2 hr of light exposure time.
c
[(baseline post − test post)/(baseline post)] × 100; larger percentage indicates more suppression by test light.
d
Dim week suppression score − bright week suppression score; positive difference indicates more suppression after dim week.
e
Dim week first.