| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 374 |
25.2%
|
| 2 | I used public transportation but no one smoked in my presence | 986 |
66.5%
|
| 3 | 1 to 2 days | 58 |
3.9%
|
| 4 | 3 to 4 days | 14 |
0.9%
|
| 5 | 5 to 6 days | 14 |
0.9%
|
| 6 | 7 days | 37 |
2.5%
|
| Sysmiss | 12 |