| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 739 |
48.5%
|
| 2 | I used public transportation but no one smoked in my presence | 328 |
21.5%
|
| 3 | 1 to 2 days | 211 |
13.9%
|
| 4 | 3 to 4 days | 78 |
5.1%
|
| 5 | 5 to 6 days | 36 |
2.4%
|
| 6 | 7 days | 131 |
8.6%
|
| Sysmiss | 13 |