| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
4.3%
|
| 0 | Less than 1 hour | 16 |
22.9%
|
| 1 | 5 |
7.1%
|
|
| 2 | 12 |
17.1%
|
|
| 3 | 4 |
5.7%
|
|
| 4 | 3 |
4.3%
|
|
| 5 | 5 |
7.1%
|
|
| 6 | 1 |
1.4%
|
|
| 8 | 1 |
1.4%
|
|
| 10 | 4 |
5.7%
|
|
| 12 | 1 |
1.4%
|
|
| 16 | 1 |
1.4%
|
|
| 20 | 4 |
5.7%
|
|
| 30 | 2 |
2.9%
|
|
| 48 | 2 |
2.9%
|
|
| 50 | 1 |
1.4%
|
|
| 60 | 1 |
1.4%
|
|
| 65 | 1 |
1.4%
|
|
| 90 | 1 |
1.4%
|
|
| 120 | 1 |
1.4%
|
|
| 140 | 1 |
1.4%
|
|
| Sysmiss | 33 |