| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1%
|
| 0 | Less than 1 hour | 25 |
24%
|
| 1 | 20 |
19.2%
|
|
| 2 | 13 |
12.5%
|
|
| 3 | 16 |
15.4%
|
|
| 4 | 12 |
11.5%
|
|
| 5 | 3 |
2.9%
|
|
| 6 | 1 |
1%
|
|
| 8 | 5 |
4.8%
|
|
| 10 | 3 |
2.9%
|
|
| 12 | 1 |
1%
|
|
| 24 | 1 |
1%
|
|
| 48 | 1 |
1%
|
|
| 90 | 1 |
1%
|
|
| 720 | 1 |
1%
|
|
| Sysmiss | 250 |