| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
1.1%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 50 |
13.7%
|
| 0 | 300 |
82.4%
|
|
| 10 | 1 |
0.3%
|
|
| 50 | 3 |
0.8%
|
|
| 70 | 1 |
0.3%
|
|
| 100 | 5 |
1.4%
|
|
| Sysmiss | 1 |