| Value | Category | Cases | |
|---|---|---|---|
| 1 | I did not use public transportation during the past 7 days | 1486 |
43.8%
|
| 2 | I used public transportation but no one smoked in my presence | 1402 |
41.3%
|
| 3 | 1 to 2 days | 262 |
7.7%
|
| 4 | 3 to 4 days | 86 |
2.5%
|
| 5 | 5 to 6 days | 53 |
1.6%
|
| 6 | 7 days | 105 |
3.1%
|
| Sysmiss | 6 |