| Value |
Category |
| 1 |
Father |
| 2 |
Mother |
| 3 |
Both parents |
| 4 |
Sister or brother |
| 5 |
Relatives (uncle, aunt) |
| 6 |
Nobody is smoking |
| 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.
