| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 2625 |
81%
|
| 2 | I used public transportation but no one smoked in my presence | 359 |
11.1%
|
| 3 | 1 to 2 days | 178 |
5.5%
|
| 4 | 3 to 4 days | 30 |
0.9%
|
| 5 | 5 to 6 days | 19 |
0.6%
|
| 6 | 7 days | 31 |
1%
|
| Sysmiss | 5 |