| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 658 |
43.8%
|
| 2 | I used public transportation but no one smoked in my presence | 320 |
21.3%
|
| 3 | 1 to 2 days | 254 |
16.9%
|
| 4 | 3 to 4 days | 185 |
12.3%
|
| 5 | 5 to 6 days | 16 |
1.1%
|
| 6 | 7 days | 71 |
4.7%
|
| Sysmiss | 14 |