| Value | Category | Cases | |
|---|---|---|---|
| 1 | 15 minutes or less | 296 |
35.3%
|
| 2 | 16–30 minutes | 388 |
46.2%
|
| 3 | 31–60 minutes | 127 |
15.1%
|
| 4 | More than 60 minutes | 28 |
3.3%
|
| Sysmiss | 161 |