| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 4781 |
55.2%
|
| 2 | I used public transportation but no one smoked in my presence | 2521 |
29.1%
|
| 3 | 1 to 2 days | 720 |
8.3%
|
| 4 | 3 to 4 days | 264 |
3.1%
|
| 5 | 5 to 6 days | 166 |
1.9%
|
| 6 | 7 days | 203 |
2.3%
|
| Sysmiss | 68 |