| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 1358 |
53.6%
|
| 2 | I used public transportation but no one smoked in my presence | 355 |
14%
|
| 3 | 1 to 2 days | 316 |
12.5%
|
| 4 | 3 to 4 days | 192 |
7.6%
|
| 5 | 5 to 6 days | 66 |
2.6%
|
| 6 | 7 days | 247 |
9.7%
|
| Sysmiss | 26 |