| Value |
Category |
| 1 |
Never smoked |
| 2 |
Did not stop smoking |
| 3 |
Between 1 to 3 months |
| 4 |
Between 4 to 11 months |
| 5 |
a year ago |
| 6 |
two year ago |
| 7 |
3 or more years ago |
| Sysmiss |
|
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.
