| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 1786 |
31.7%
|
| 2 | I used public transportation but no one smoked in my presence | 3415 |
60.7%
|
| 3 | 1 to 2 days | 251 |
4.5%
|
| 4 | 3 to 4 days | 64 |
1.1%
|
| 5 | 5 to 6 days | 31 |
0.6%
|
| 6 | 7 days | 80 |
1.4%
|
| Sysmiss | 71 |