| Value | Category | Cases | |
|---|---|---|---|
| 1 | Within 3 months or less | 35 |
3.8%
|
| 2 | After 3 months | 16 |
1.7%
|
| 3 | Not sure to return | 48 |
5.2%
|
| 9 | 820 |
89.2%
|
|
| Sysmiss | 17150 |