| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 27867 |
42.9%
|
| 2 | I used public transportation but no one smoked in my presence | 27259 |
41.9%
|
| 3 | 1 to 2 days | 5258 |
8.1%
|
| 4 | 3 to 4 days | 1611 |
2.5%
|
| 5 | 5 to 6 days | 889 |
1.4%
|
| 6 | 7 days | 2127 |
3.3%
|
| Sysmiss | 524 |