| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
7.5%
|
| 0 | Less than 1 hour | 27 |
29%
|
| 1 | 4 |
4.3%
|
|
| 2 | 13 |
14%
|
|
| 3 | 7 |
7.5%
|
|
| 4 | 3 |
3.2%
|
|
| 5 | 4 |
4.3%
|
|
| 6 | 3 |
3.2%
|
|
| 8 | 3 |
3.2%
|
|
| 10 | 4 |
4.3%
|
|
| 12 | 2 |
2.2%
|
|
| 16 | 1 |
1.1%
|
|
| 20 | 1 |
1.1%
|
|
| 24 | 2 |
2.2%
|
|
| 30 | 2 |
2.2%
|
|
| 48 | 3 |
3.2%
|
|
| 52 | 1 |
1.1%
|
|
| 60 | 2 |
2.2%
|
|
| 90 | 1 |
1.1%
|
|
| 100 | 1 |
1.1%
|
|
| 120 | 2 |
2.2%
|
|
| Sysmiss | 260 |