| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. dark, gloomy | 601 |
19.7%
|
| 2 | 2. poor light | 547 |
17.9%
|
| 3 | 3. average light | 925 |
30.3%
|
| 4 | 4. bright | 980 |
32.1%
|
| Sysmiss | 1485 |