| Value | Category | Cases | |
|---|---|---|---|
| 1 | within one week | 357 |
76.6%
|
| 2 | within two weeks | 47 |
10.1%
|
| 3 | within one month | 44 |
9.4%
|
| 4 | more than one month | 18 |
3.9%
|
| Sysmiss | 125 |