| Value |
Category |
| 1 |
Two years or less |
| 2 |
More than two years, but less than five years |
| 3 |
More than five years |
| 4 |
Don’t know |
| 8 |
Not applicable |
| 9 |
Unspecified |
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.