| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 473 |
35.5%
|
| 2 | I used public transportation but no one smoked in my presence | 511 |
38.4%
|
| 3 | 1 to 2 days | 193 |
14.5%
|
| 4 | 3 to 4 days | 76 |
5.7%
|
| 5 | 5 to 6 days | 24 |
1.8%
|
| 6 | 7 days | 55 |
4.1%
|
| Sysmiss | 13 |