| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. dark, gloomy | 50 |
1.6%
|
| 2 | 2. poor light | 135 |
4.4%
|
| 3 | 3. average light | 352 |
11.6%
|
| 4 | 4. bright | 2503 |
82.3%
|
| Sysmiss | 1498 |