| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 837 |
56.5%
|
| 2 | I used public transportation but no one smoked in my presence | 550 |
37.1%
|
| 3 | 1 to 2 days | 51 |
3.4%
|
| 4 | 3 to 4 days | 13 |
0.9%
|
| 5 | 5 to 6 days | 13 |
0.9%
|
| 6 | 7 days | 18 |
1.2%
|
| Sysmiss | 50 |