| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.2%
|
| 1 | One hour or less | 22 |
27.2%
|
| 2 | 12 |
14.8%
|
|
| 3 | 8 |
9.9%
|
|
| 4 | 3 |
3.7%
|
|
| 5 | 6 |
7.4%
|
|
| 6 | 6 |
7.4%
|
|
| 7 | 4 |
4.9%
|
|
| 8 | 2 |
2.5%
|
|
| 9 | 2 |
2.5%
|
|
| 10 | 2 |
2.5%
|
|
| 11 | 1 |
1.2%
|
|
| 12 | 1 |
1.2%
|
|
| 15 | 2 |
2.5%
|
|
| 17 | 1 |
1.2%
|
|
| 19 | 1 |
1.2%
|
|
| 21 | 1 |
1.2%
|
|
| 24 | 3 |
3.7%
|
|
| 30 | 1 |
1.2%
|
|
| 72 | 1 |
1.2%
|
|
| 120 | 1 |
1.2%
|
|
| Sysmiss | 932 |