| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 901 |
42.2%
|
| 2 | I used public transportation but no one smoked in my presence | 840 |
39.4%
|
| 3 | 1 to 2 days | 265 |
12.4%
|
| 4 | 3 to 4 days | 95 |
4.5%
|
| 5 | 5 to 6 days | 33 |
1.5%
|
| 6 | 7 days | 0 |
0%
|
| Sysmiss | 86 |