| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 1097 |
54.8%
|
| 2 | I used public transportation but no one smoked in my presence | 355 |
17.7%
|
| 3 | 1 to 2 days | 268 |
13.4%
|
| 4 | 3 to 4 days | 121 |
6%
|
| 5 | 5 to 6 days | 60 |
3%
|
| 6 | 7 days | 101 |
5%
|
| Sysmiss | 105 |