| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 15 minutes | 7 |
1.5%
|
| 2 | 15 minutes to half hour | 100 |
21.5%
|
| 3 | More than half an hour, but less than 1 hour | 226 |
48.5%
|
| 4 | One hour or more | 133 |
28.5%
|
| Sysmiss | 367 |