| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. dark, gloomy | 89 |
3.1%
|
| 2 | 2. poor light | 136 |
4.7%
|
| 3 | 3. average light | 674 |
23.5%
|
| 4 | 4. bright | 1968 |
68.6%
|
| Sysmiss | 1671 |