| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.2%
|
| 1 | One hour or less | 5 |
3.1%
|
| 2 | 8 |
4.9%
|
|
| 3 | 4 |
2.5%
|
|
| 4 | 5 |
3.1%
|
|
| 5 | 4 |
2.5%
|
|
| 6 | 3 |
1.8%
|
|
| 8 | 2 |
1.2%
|
|
| 10 | 4 |
2.5%
|
|
| 12 | 3 |
1.8%
|
|
| 14 | 6 |
3.7%
|
|
| 16 | 7 |
4.3%
|
|
| 17 | 1 |
0.6%
|
|
| 18 | 4 |
2.5%
|
|
| 19 | 1 |
0.6%
|
|
| 20 | 10 |
6.1%
|
|
| 21 | 2 |
1.2%
|
|
| 22 | 23 |
14.1%
|
|
| 23 | 69 |
42.3%
|
|
| Sysmiss | 1269 |