| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | One month or less | 17 |
17.7%
|
| 2 | 21 |
21.9%
|
|
| 3 | 27 |
28.1%
|
|
| 4 | 2 |
2.1%
|
|
| 6 | 22 |
22.9%
|
|
| 7 | 1 |
1%
|
|
| 8 | 2 |
2.1%
|
|
| 10 | 1 |
1%
|
|
| 12 | 3 |
3.1%
|
|
| Sysmiss | 249 |