| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. dark gloomy | 24 |
0.6%
|
| 2 | 2. poor light | 565 |
13%
|
| 3 | 3. average light | 2090 |
47.9%
|
| 4 | 4. bright | 1519 |
34.8%
|
| 77 | 77. d/r | 0 |
0%
|
| 99 | 99. missing | 163 |
3.7%
|
| Sysmiss | 177 |