| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. less than 15 minutes | 2646 |
60.4%
|
| 2 | 2. 15 – 30 minutes | 996 |
22.8%
|
| 3 | 3. 31 – 60 minutes | 219 |
5%
|
| 4 | 4. more than an hour | 517 |
11.8%
|
| Sysmiss | 160 |