| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. dark gloomy | 233 |
5.3%
|
| 2 | 2. poor light | 907 |
20.8%
|
| 3 | 3. average light | 2282 |
52.3%
|
| 4 | 4. bright | 765 |
17.5%
|
| 77 | 77. d/r | 0 |
0%
|
| 99 | 99. missing | 174 |
4%
|
| Sysmiss | 177 |