| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.6%
|
| 1 | One hour or less | 75 |
21.9%
|
| 2 | 44 |
12.8%
|
|
| 3 | 36 |
10.5%
|
|
| 4 | 29 |
8.5%
|
|
| 5 | 28 |
8.2%
|
|
| 6 | 35 |
10.2%
|
|
| 7 | 12 |
3.5%
|
|
| 8 | 35 |
10.2%
|
|
| 9 | 3 |
0.9%
|
|
| 10 | 14 |
4.1%
|
|
| 12 | 9 |
2.6%
|
|
| 15 | 2 |
0.6%
|
|
| 24 | 13 |
3.8%
|
|
| 30 | 2 |
0.6%
|
|
| 72 | 4 |
1.2%
|
|
| Sysmiss | 306 |