| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.5%
|
| 0 | Less than 1 hour | 71 |
52.2%
|
| 1 | 22 |
16.2%
|
|
| 2 | 24 |
17.6%
|
|
| 3 | 1 |
0.7%
|
|
| 4 | 4 |
2.9%
|
|
| 5 | 6 |
4.4%
|
|
| 6 | 4 |
2.9%
|
|
| 8 | 1 |
0.7%
|
|
| 48 | 1 |
0.7%
|
|
| Sysmiss | 509 |