| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 2917 |
33.2%
|
| 2 | I used public transportation but no one smoked in my presence | 3692 |
42.1%
|
| 3 | 1 to 2 days | 1311 |
14.9%
|
| 4 | 3 to 4 days | 387 |
4.4%
|
| 5 | 5 to 6 days | 135 |
1.5%
|
| 6 | 7 days | 333 |
3.8%
|
| Sysmiss | 14 |