| Value | Category | Cases | |
|---|---|---|---|
| 1 | Chimney | 8354 |
42.9%
|
| 2 | Hood | 120 |
0.6%
|
| 3 | Neither | 11009 |
56.5%
|
| 9 | Missing | 50 | |
| Sysmiss | 329 |