| Value |
Category |
| 1 |
Less than 20 hours |
| 2 |
21-40 hours |
| 3 |
41-60 hours |
| 4 |
More than 60 hours |
| 5 |
Different in different periods (seasons) |
| 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.