| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 341 |
22.6%
|
| 2 | I used public transportation but no one smoked in my presenc | 1000 |
66.4%
|
| 3 | 1 to 2 days | 75 |
5%
|
| 4 | 3 to 4 days | 31 |
2.1%
|
| 5 | 5 to 6 days | 21 |
1.4%
|
| 6 | 7 days | 39 |
2.6%
|
| Sysmiss | 12 |