| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 1818 |
47.2%
|
| 2 | I used public transportation but no one smoked in my presence | 831 |
21.6%
|
| 3 | 1 to 2 days | 679 |
17.6%
|
| 4 | 3 to 4 days | 213 |
5.5%
|
| 5 | 5 to 6 days | 115 |
3%
|
| 6 | 7 days | 197 |
5.1%
|
| Sysmiss | 58 |