| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never prolonged | 6 |
85.7%
|
| 1 | Prolonged (hours) | 1 |
14.3%
|
| 8 | Unknown | 0 |
0%
|
| 9 | Missing | 0 | |
| Sysmiss | 5 |