| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. 6 hours | 514 |
11.7%
|
| 2 | 2. 6.5 hours | 200 |
4.6%
|
| 3 | 3. 7 hours | 2374 |
54.2%
|
| 4 | 4. 7.5 hours | 140 |
3.2%
|
| 5 | 5. 8 hours | 911 |
20.8%
|
| 6 | 6. 8.5 hours | 99 |
2.3%
|
| 7 | 7. 9 hours or more | 140 |
3.2%
|
| Sysmiss | 160 |