| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 1739 |
49.8%
|
| 2 | I used public transportation but no one smoked in my presence | 844 |
24.1%
|
| 3 | 1 to 2 days | 392 |
11.2%
|
| 4 | 3 to 4 days | 173 |
4.9%
|
| 5 | 5 to 6 days | 158 |
4.5%
|
| 6 | 7 days | 189 |
5.4%
|
| Sysmiss | 27 |