| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 31 |
9.2%
|
| 1 | One hour or less | 123 |
36.4%
|
| 2 | 46 |
13.6%
|
|
| 3 | 21 |
6.2%
|
|
| 4 | 23 |
6.8%
|
|
| 5 | 20 |
5.9%
|
|
| 6 | 14 |
4.1%
|
|
| 8 | 8 |
2.4%
|
|
| 9 | 1 |
0.3%
|
|
| 10 | 15 |
4.4%
|
|
| 12 | 7 |
2.1%
|
|
| 13 | 1 |
0.3%
|
|
| 15 | 4 |
1.2%
|
|
| 18 | 1 |
0.3%
|
|
| 20 | 4 |
1.2%
|
|
| 21 | 1 |
0.3%
|
|
| 22 | 1 |
0.3%
|
|
| 24 | 10 |
3%
|
|
| 25 | 1 |
0.3%
|
|
| 30 | 2 |
0.6%
|
|
| 35 | 1 |
0.3%
|
|
| 50 | 1 |
0.3%
|
|
| 72 | 2 |
0.6%
|
|
| Sysmiss | 18319 |