| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. dark gloomy | 329 |
7.5%
|
| 2 | 2. poor light | 1453 |
33.3%
|
| 3 | 3. average light | 1953 |
44.8%
|
| 4 | 4. bright | 528 |
12.1%
|
| 77 | 77. d/r | 0 |
0%
|
| 99 | 99. missing | 98 |
2.2%
|
| Sysmiss | 177 |