| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 283 |
43%
|
| 2 | Less than 6 hours | 155 |
23.6%
|
| 3 | 6–15 hours | 116 |
17.6%
|
| 4 | 16–35 hours | 59 |
9%
|
| 5 | More than 35 hours | 45 |
6.8%
|
| Sysmiss | 342 |