| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
5%
|
| 0 | Less than 1 hour | 40 |
40%
|
| 1 | 21 |
21%
|
|
| 2 | 11 |
11%
|
|
| 3 | 5 |
5%
|
|
| 4 | 3 |
3%
|
|
| 5 | 4 |
4%
|
|
| 6 | 1 |
1%
|
|
| 10 | 2 |
2%
|
|
| 13 | 1 |
1%
|
|
| 18 | 1 |
1%
|
|
| 20 | 2 |
2%
|
|
| 24 | 2 |
2%
|
|
| 48 | 2 |
2%
|
|
| Sysmiss | 260 |