| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 900 |
24.6%
|
| 2 | I used public transportation but no one smoked in my presence | 1862 |
50.8%
|
| 3 | 1 to 2 days | 499 |
13.6%
|
| 4 | 3 to 4 days | 191 |
5.2%
|
| 5 | 5 to 6 days | 96 |
2.6%
|
| 6 | 7 days | 115 |
3.1%
|
| Sysmiss | 34 |