| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. very stuffy | 155 |
5.6%
|
| 2 | 2. a little stuffy | 352 |
12.8%
|
| 3 | 3. average | 703 |
25.5%
|
| 4 | 4. fresh air | 1548 |
56.1%
|
| Sysmiss | 1780 |