| Value | Category | Cases | |
|---|---|---|---|
| 1 | Within one week | 28 |
32.2%
|
| 2 | Within one month | 16 |
18.4%
|
| 3 | Within three months | 17 |
19.5%
|
| 4 | In more than three months | 14 |
16.1%
|
| 98 | Don't know | 12 |
13.8%
|
| Sysmiss | 1669 |