| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
3.6%
|
| 1 | One hour or less | 30 |
36.1%
|
| 2 | 8 |
9.6%
|
|
| 3 | 19 |
22.9%
|
|
| 4 | 4 |
4.8%
|
|
| 5 | 4 |
4.8%
|
|
| 6 | 3 |
3.6%
|
|
| 10 | 3 |
3.6%
|
|
| 12 | 3 |
3.6%
|
|
| 15 | 1 |
1.2%
|
|
| 17 | 1 |
1.2%
|
|
| 18 | 1 |
1.2%
|
|
| 21 | 1 |
1.2%
|
|
| 30 | 2 |
2.4%
|
|
| Sysmiss | 936 |