| Value | Category | Cases | |
|---|---|---|---|
| 1 | Yes_ Natural ventilation (windows, doors) | 3299 |
21.7%
|
| 2 | Yes_ Artificial ventilation (vacuum) | 240 |
1.6%
|
| 3 | No ventilation | 17 |
0.1%
|
| Sysmiss | 11617 |