| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. dark gloomy | 735 |
16.9%
|
| 2 | 2. poor light | 963 |
22.1%
|
| 3 | 3. average light | 1483 |
34%
|
| 4 | 4. bright | 1081 |
24.8%
|
| 77 | 77. d/r | 0 |
0%
|
| 99 | 99. missing | 99 |
2.3%
|
| Sysmiss | 177 |