| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 30 minutes | 1682 |
6.8%
|
| 2 | Less than 1 hour (but more than 30 minutes) | 941 |
3.8%
|
| 3 | Less than 2 hours (but more than 1 hour) | 233 |
0.9%
|
| 4 | More than 2 hours | 48 |
0.2%
|
| 8 | Not applicable | 21460 |
86.9%
|
| 9 | Unspecified | 337 |
1.4%
|