| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 864 |
43.1%
|
| 2 | I used public transportation but no one smoked in my presence | 476 |
23.8%
|
| 3 | 1 to 2 days | 308 |
15.4%
|
| 4 | 3 to 4 days | 123 |
6.1%
|
| 5 | 5 to 6 days | 81 |
4%
|
| 6 | 7 days | 152 |
7.6%
|
| Sysmiss | 43 |