| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 753 |
40.1%
|
| 2 | I used public transportation but no one smoked in my presence | 896 |
47.8%
|
| 3 | 1 to 2 days | 103 |
5.5%
|
| 4 | 3 to 4 days | 45 |
2.4%
|
| 5 | 5 to 6 days | 21 |
1.1%
|
| 6 | 7 days | 58 |
3.1%
|
| Sysmiss | 19 |