| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 155 |
2.8%
|
| 2 | Less than 30 minutes | 928 |
16.6%
|
| 3 | 30 minutes - 1 hour | 987 |
17.6%
|
| 4 | 1 - 2 hours | 1751 |
31.2%
|
| 5 | 2 - 3 hours | 1146 |
20.4%
|
| 6 | 3 - 4 hours | 438 |
7.8%
|
| 7 | More than 4 hours | 199 |
3.6%
|
| Sysmiss | 18136 |