| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 3 hours | 40 |
0.2%
|
| 2 | 3 to 4 hours | 2484 |
11.5%
|
| 3 | 5 to 6 hours | 6588 |
30.4%
|
| 4 | 8 to 10 hours | 8147 |
37.6%
|
| 5 | 10 to 12 hours | 4261 |
19.7%
|
| 6 | 24 hours when needed | 144 |
0.7%
|
| Sysmiss | 1818 |