| Value | Category | Cases | |
|---|---|---|---|
| 1 | a. Within 1 week | 51 |
18.5%
|
| 2 | b. Within 1 month | 166 |
60.4%
|
| 3 | c. Within 3 months | 45 |
16.4%
|
| 4 | d. Within 6 months | 10 |
3.6%
|
| 5 | e. Within 1 year | 3 |
1.1%
|
| Sysmiss | 4693 |