| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 1220 |
77.6%
|
| 2 | I used public transportation but no one smoked in my presence | 204 |
13%
|
| 3 | 1 to 2 days | 70 |
4.5%
|
| 4 | 3 to 4 days | 33 |
2.1%
|
| 5 | 5 to 6 days | 19 |
1.2%
|
| 6 | 7 days | 26 |
1.7%
|
| Sysmiss | 2 |