| Value |
Category |
| -9 |
Don't know |
| -8 |
Refused |
| -5 |
Not applicable |
| -3 |
Missing |
| 1 |
Days |
| 2 |
Months |
| 3 |
Years |
| 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.