| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 1328 |
47.8%
|
| 2 | I used public transportation but no one smoked in my presence | 846 |
30.5%
|
| 3 | 1 to 2 days | 346 |
12.5%
|
| 4 | 3 to 4 days | 95 |
3.4%
|
| 5 | 5 to 6 days | 71 |
2.6%
|
| 6 | 7 days | 90 |
3.2%
|
| Sysmiss | 34 |