| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 24 |
6.7%
|
| 0 | Less than 1 hour | 49 |
13.7%
|
| 1 | 41 |
11.5%
|
|
| 2 | 99 |
27.7%
|
|
| 3 | 57 |
15.9%
|
|
| 4 | 18 |
5%
|
|
| 5 | 18 |
5%
|
|
| 6 | 7 |
2%
|
|
| 7 | 3 |
0.8%
|
|
| 8 | 5 |
1.4%
|
|
| 10 | 5 |
1.4%
|
|
| 12 | 6 |
1.7%
|
|
| 15 | 2 |
0.6%
|
|
| 18 | 1 |
0.3%
|
|
| 20 | 1 |
0.3%
|
|
| 24 | 7 |
2%
|
|
| 30 | 3 |
0.8%
|
|
| 36 | 2 |
0.6%
|
|
| 48 | 4 |
1.1%
|
|
| 60 | 1 |
0.3%
|
|
| 72 | 3 |
0.8%
|
|
| 120 | 1 |
0.3%
|
|
| 170 | 1 |
0.3%
|
|
| Sysmiss | 291 |