| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 30 minutes | 1227 |
5.7%
|
| 2 | Less than 1 hour (but more than 30 minutes) | 729 |
3.4%
|
| 3 | Less than 2 hours (but more than 1 hour) | 138 |
0.6%
|
| 4 | More than 2 hours | 29 |
0.1%
|
| 8 | Not applicable | 18206 |
85.2%
|
| 9 | Unspecified | 1045 |
4.9%
|