| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 3438 |
32.5%
|
| 2 | I used public transportation but no one smoked in my presence | 5336 |
50.5%
|
| 3 | 1 to 2 days | 1035 |
9.8%
|
| 4 | 3 to 4 days | 307 |
2.9%
|
| 5 | 5 to 6 days | 170 |
1.6%
|
| 6 | 7 days | 282 |
2.7%
|
| Sysmiss | 34 |