| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. dark gloomy | 40 |
0.9%
|
| 2 | 2. poor light | 113 |
2.6%
|
| 3 | 3. average light | 647 |
14.8%
|
| 4 | 4. bright | 3412 |
78.2%
|
| 77 | 77. d/r | 0 |
0%
|
| 99 | 99. missing | 149 |
3.4%
|
| Sysmiss | 177 |