| Value |
Category |
| 1 |
I have never smoked |
| 2 |
Less than 1 week |
| 3 |
1 week to 15 days |
| 4 |
16 days to 1 month |
| 5 |
2 to 3 months |
| 6 |
4 to 6 months |
| 7 |
6 months to 1 year |
| 8 |
More than 1 year |
| 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.
