Value |
Category |
0 |
|
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.