| Value | Category | Cases | |
|---|---|---|---|
| 1 | 4 or less hours | 1029 |
27.7%
|
| 2 | 5 hours | 575 |
15.5%
|
| 3 | 6 hours | 462 |
12.4%
|
| 4 | 7 hours | 473 |
12.7%
|
| 5 | 8 hours | 636 |
17.1%
|
| 6 | 9 hours | 244 |
6.6%
|
| 7 | 10 hours | 124 |
3.3%
|
| 8 | 11 or more hours | 174 |
4.7%
|
| Sysmiss | 79 |