| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 52544 |
43.4%
|
| 2 | I used public transportation but no one smoked in my presence | 50073 |
41.4%
|
| 3 | 1 to 2 days | 9601 |
7.9%
|
| 4 | 3 to 4 days | 2972 |
2.5%
|
| 5 | 5 to 6 days | 1691 |
1.4%
|
| 6 | 7 days | 4141 |
3.4%
|
| Sysmiss | 1018 |