| Value |
Category |
| 1 |
1-2 hrs |
| 2 |
3-4 hrs |
| 3 |
5-6 hrs |
| 4 |
6-10 hrs |
| 5 |
Less one hour |
| 6 |
More than 10 hrs |
| 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.