| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 910 |
38%
|
| 2 | I used public transportation but no one smoked in my presence | 478 |
20%
|
| 3 | 1 to 2 days | 340 |
14.2%
|
| 4 | 3 to 4 days | 399 |
16.7%
|
| 5 | 5 to 6 days | 91 |
3.8%
|
| 6 | 7 days | 175 |
7.3%
|
| Sysmiss | 78 |