| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 30 minutes | 1040 |
4.9%
|
| 2 | Less than 1 hour (but more than 30 minutes) | 621 |
2.9%
|
| 3 | Less than 2 hours (but more than 1 hour) | 79 |
0.4%
|
| 4 | More than 2 hours | 47 |
0.2%
|
| 8 | Not applicable | 19070 |
90.4%
|
| 9 | Unspecified | 238 |
1.1%
|