| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 5796 |
46.4%
|
| 2 | I used public transportation but no one smoked in my presence | 5151 |
41.3%
|
| 3 | 1 to 2 days | 949 |
7.6%
|
| 4 | 3 to 4 days | 289 |
2.3%
|
| 5 | 5 to 6 days | 147 |
1.2%
|
| 6 | 7 days | 155 |
1.2%
|
| Sysmiss | 98 |