| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
4.8%
|
| 1 | One hour or less | 13 |
15.7%
|
| 2 | 5 |
6%
|
|
| 3 | 3 |
3.6%
|
|
| 4 | 3 |
3.6%
|
|
| 5 | 4 |
4.8%
|
|
| 6 | 3 |
3.6%
|
|
| 8 | 5 |
6%
|
|
| 10 | 3 |
3.6%
|
|
| 12 | 5 |
6%
|
|
| 14 | 1 |
1.2%
|
|
| 16 | 2 |
2.4%
|
|
| 18 | 1 |
1.2%
|
|
| 20 | 1 |
1.2%
|
|
| 24 | 20 |
24.1%
|
|
| 31 | 1 |
1.2%
|
|
| 48 | 4 |
4.8%
|
|
| 72 | 4 |
4.8%
|
|
| 75 | 1 |
1.2%
|
|
| Sysmiss | 347 |