| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 2358 |
50.8%
|
| 2 | I used public transportation but no one smoked in my presence | 1362 |
29.3%
|
| 3 | 1 to 2 days | 481 |
10.4%
|
| 4 | 3 to 4 days | 191 |
4.1%
|
| 5 | 5 to 6 days | 50 |
1.1%
|
| 6 | 7 days | 202 |
4.3%
|
| Sysmiss | 28 |