| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 3463 |
65.5%
|
| 2 | I used public transportation but no one smoked in my presence | 1521 |
28.8%
|
| 3 | 1 to 2 days | 186 |
3.5%
|
| 4 | 3 to 4 days | 67 |
1.3%
|
| 5 | 5 to 6 days | 13 |
0.2%
|
| 6 | 7 days | 38 |
0.7%
|
| Sysmiss | 10 |