| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 577 |
24.2%
|
| 2 | 1 Hour | 871 |
36.6%
|
| 3 | More than 1 hour | 413 |
17.4%
|
| 4 | More than 1.5 hours | 519 |
21.8%
|
| Sysmiss | 947 |