| Value | Category | Cases | |
|---|---|---|---|
| 1 | 4 or less hours | 532 |
14.3%
|
| 2 | 5 hours | 389 |
10.5%
|
| 3 | 6 hours | 520 |
14%
|
| 4 | 7 hours | 678 |
18.3%
|
| 5 | 8 hours | 786 |
21.2%
|
| 6 | 9 hours | 301 |
8.1%
|
| 7 | 10 hours | 220 |
5.9%
|
| 8 | 11 or more hours | 283 |
7.6%
|
| Sysmiss | 463 |