| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | One hour or less | 17 |
12.8%
|
| 2 | 18 |
13.5%
|
|
| 3 | 14 |
10.5%
|
|
| 4 | 13 |
9.8%
|
|
| 5 | 11 |
8.3%
|
|
| 6 | 9 |
6.8%
|
|
| 7 | 1 |
0.8%
|
|
| 8 | 1 |
0.8%
|
|
| 10 | 3 |
2.3%
|
|
| 12 | 7 |
5.3%
|
|
| 15 | 3 |
2.3%
|
|
| 18 | 2 |
1.5%
|
|
| 20 | 2 |
1.5%
|
|
| 24 | 8 |
6%
|
|
| 30 | 1 |
0.8%
|
|
| 35 | 1 |
0.8%
|
|
| 36 | 2 |
1.5%
|
|
| 40 | 1 |
0.8%
|
|
| 42 | 1 |
0.8%
|
|
| 48 | 7 |
5.3%
|
|
| 72 | 6 |
4.5%
|
|
| 96 | 2 |
1.5%
|
|
| 168 | 3 |
2.3%
|
|
| Sysmiss | 225 |