| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 726 |
31.8%
|
| 2 | I used public transportation but no one smoked in my presence | 635 |
27.8%
|
| 3 | 1 to 2 days | 341 |
14.9%
|
| 4 | 3 to 4 days | 161 |
7.1%
|
| 5 | 5 to 6 days | 143 |
6.3%
|
| 6 | 7 days | 276 |
12.1%
|
| Sysmiss | 19 |