| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 1955 |
48%
|
| 2 | I used public transportation but no one smoked in my presence | 1617 |
39.7%
|
| 3 | 1 to 2 days | 246 |
6%
|
| 4 | 3 to 4 days | 82 |
2%
|
| 5 | 5 to 6 days | 72 |
1.8%
|
| 6 | 7 days | 105 |
2.6%
|
| Sysmiss | 51 |