| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | One month or less | 4 |
2%
|
| 2 | 8 |
3.9%
|
|
| 3 | 26 |
12.7%
|
|
| 4 | 24 |
11.8%
|
|
| 5 | 22 |
10.8%
|
|
| 6 | 76 |
37.3%
|
|
| 7 | 23 |
11.3%
|
|
| 8 | 18 |
8.8%
|
|
| 9 | 2 |
1%
|
|
| 12 | 1 |
0.5%
|
|
| Sysmiss | 394 |