| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 903 |
42.8%
|
| 2 | I used public transportation but no one smoked in my presence | 495 |
23.4%
|
| 3 | 1 to 2 days | 311 |
14.7%
|
| 4 | 3 to 4 days | 134 |
6.3%
|
| 5 | 5 to 6 days | 70 |
3.3%
|
| 6 | 7 days | 199 |
9.4%
|
| Sysmiss | 20 |