| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
2.6%
|
| 0 | Less than 1 hour | 120 |
44.4%
|
| 1 | 26 |
9.6%
|
|
| 2 | 36 |
13.3%
|
|
| 3 | 12 |
4.4%
|
|
| 4 | 12 |
4.4%
|
|
| 5 | 15 |
5.6%
|
|
| 6 | 2 |
0.7%
|
|
| 7 | 2 |
0.7%
|
|
| 8 | 3 |
1.1%
|
|
| 9 | 1 |
0.4%
|
|
| 10 | 5 |
1.9%
|
|
| 12 | 3 |
1.1%
|
|
| 16 | 1 |
0.4%
|
|
| 18 | 1 |
0.4%
|
|
| 20 | 2 |
0.7%
|
|
| 24 | 6 |
2.2%
|
|
| 25 | 1 |
0.4%
|
|
| 28 | 1 |
0.4%
|
|
| 30 | 3 |
1.1%
|
|
| 36 | 1 |
0.4%
|
|
| 40 | 1 |
0.4%
|
|
| 43 | 1 |
0.4%
|
|
| 48 | 2 |
0.7%
|
|
| 60 | 1 |
0.4%
|
|
| 72 | 2 |
0.7%
|
|
| 84 | 1 |
0.4%
|
|
| 168 | 1 |
0.4%
|
|
| 720 | 1 |
0.4%
|
|
| Sysmiss | 1146 |