| Value |
Category |
| 1 |
No smoking |
| 2 |
Less than 10 per day |
| 3 |
Between 10 and 30 per day |
| 4 |
More than 30 per day |
| 9 |
|
| 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.