| Value |
Category |
| 1 |
One season |
| 2 |
One year |
| 3 |
Two years |
| 4 |
Three years |
| 5 |
More than three years |
| 6 |
Unspecified |
| 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.
