| Value | Category | Cases | |
|---|---|---|---|
| 1 | chamber industrial (800-1000+) | 2 |
50%
|
| 2 | chamber drum/brick | 2 |
50%
|
| 3 | Other | 0 |
0%
|
| 4 | Don't know | 0 |
0%
|
| 5 | Refuse to answer | 0 |
0%
|
| Sysmiss | 467 |