| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. dark gloomy | 663 |
15.2%
|
| 2 | 2. poor light | 1063 |
24.4%
|
| 3 | 3. average light | 1637 |
37.5%
|
| 4 | 4. bright | 873 |
20%
|
| 77 | 77. d/r | 0 |
0%
|
| 99 | 99. missing | 125 |
2.9%
|
| Sysmiss | 177 |