| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 1461 |
36.2%
|
| 2 | I used public transportation but no one smoked in my presence | 891 |
22.1%
|
| 3 | 1 to 2 days | 1008 |
25%
|
| 4 | 3 to 4 days | 481 |
11.9%
|
| 5 | 5 to 6 days | 160 |
4%
|
| 6 | 7 days | 39 |
1%
|
| Sysmiss | 106 |