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Demographic data and light exposure illuminance for the four duration groups
| LE duration (h) | Age (years ± SD) | Sex (f/m) | LE illuminance (lux ± SD) |
|---|---|---|---|
| 0.2 | 21.78 ± 3.19 | 3/6 | 7669 ± 1321 |
| 1.0 | 21.70 ± 2.79 | 4/6 | 9040 ± 498 |
| 2.5 | 22.30 ± 4.52 | 4/6 | 8927 ± 666 |
| 4.0 | 22.90 ± 4.12 | 5/5 | 8396 ± 1604 |
Illuminance levels among the four groups were not significantly different (P= 0.06).
