| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.2%
|
| 0 | Less than 1 hour | 53 |
63.9%
|
| 1 | 9 |
10.8%
|
|
| 2 | 7 |
8.4%
|
|
| 3 | 1 |
1.2%
|
|
| 4 | 3 |
3.6%
|
|
| 5 | 2 |
2.4%
|
|
| 6 | 2 |
2.4%
|
|
| 7 | 1 |
1.2%
|
|
| 20 | 1 |
1.2%
|
|
| 35 | 2 |
2.4%
|
|
| 40 | 1 |
1.2%
|
|
| Sysmiss | 930 |