| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 3103 |
47.8%
|
| 2 | I used public transportation but no one smoked in my presence | 2020 |
31.1%
|
| 3 | 1 to 2 days | 657 |
10.1%
|
| 4 | 3 to 4 days | 233 |
3.6%
|
| 5 | 5 to 6 days | 180 |
2.8%
|
| 6 | 7 days | 303 |
4.7%
|
| Sysmiss | 164 |