| Value | Category | Cases | |
|---|---|---|---|
| 0 | 8 |
1%
|
|
| 1 | Yes | 425 |
55.2%
|
| 2 | No | 323 |
41.9%
|
| 3 | No, but ex-smoker | 14 |
1.8%
|
| Sysmiss | 1 |