| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.1%
|
| 0 | Less than 1 hour | 28 |
15.6%
|
| 1 | 11 |
6.1%
|
|
| 2 | 25 |
13.9%
|
|
| 3 | 19 |
10.6%
|
|
| 4 | 13 |
7.2%
|
|
| 5 | 18 |
10%
|
|
| 6 | 7 |
3.9%
|
|
| 7 | 3 |
1.7%
|
|
| 8 | 6 |
3.3%
|
|
| 9 | 1 |
0.6%
|
|
| 10 | 4 |
2.2%
|
|
| 12 | 6 |
3.3%
|
|
| 15 | 3 |
1.7%
|
|
| 16 | 1 |
0.6%
|
|
| 20 | 4 |
2.2%
|
|
| 24 | 18 |
10%
|
|
| 30 | 1 |
0.6%
|
|
| 35 | 1 |
0.6%
|
|
| 36 | 1 |
0.6%
|
|
| 45 | 2 |
1.1%
|
|
| 48 | 3 |
1.7%
|
|
| 50 | 2 |
1.1%
|
|
| 72 | 1 |
0.6%
|
|
| Sysmiss | 442 |