| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
5.2%
|
| 0 | Less than 1 hour | 19 |
24.7%
|
| 1 | 10 |
13%
|
|
| 2 | 11 |
14.3%
|
|
| 3 | 11 |
14.3%
|
|
| 4 | 5 |
6.5%
|
|
| 5 | 5 |
6.5%
|
|
| 10 | 1 |
1.3%
|
|
| 12 | 1 |
1.3%
|
|
| 20 | 1 |
1.3%
|
|
| 21 | 1 |
1.3%
|
|
| 24 | 2 |
2.6%
|
|
| 30 | 1 |
1.3%
|
|
| 40 | 2 |
2.6%
|
|
| 48 | 1 |
1.3%
|
|
| 72 | 1 |
1.3%
|
|
| 100 | 1 |
1.3%
|
|
| Sysmiss | 234 |