| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. dark gloomy | 1113 |
25.5%
|
| 2 | 2. poor light | 1188 |
27.2%
|
| 3 | 3. average light | 1218 |
27.9%
|
| 4 | 4. bright | 600 |
13.8%
|
| 77 | 77. d/r | 0 |
0%
|
| 99 | 99. missing | 242 |
5.5%
|
| Sysmiss | 177 |