| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 557 |
27.9%
|
| 2 | I used public transportation but no one smoked in my presence | 482 |
24.1%
|
| 3 | 1 to 2 days | 424 |
21.2%
|
| 4 | 3 to 4 days | 123 |
6.2%
|
| 5 | 5 to 6 days | 63 |
3.2%
|
| 6 | 7 days | 348 |
17.4%
|
| Sysmiss | 55 |