| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 2488 |
67.1%
|
| 2 | I used public transportation but no one smoked in my presence | 798 |
21.5%
|
| 3 | 1 to 2 days | 303 |
8.2%
|
| 4 | 3 to 4 days | 55 |
1.5%
|
| 5 | 5 to 6 days | 25 |
0.7%
|
| 6 | 7 days | 40 |
1.1%
|
| Sysmiss | 7 |