| Value | Category | Cases | |
|---|---|---|---|
| 1 | Within the past three months | 23 |
47.9%
|
| 2 | Between 3-6 months | 4 |
8.3%
|
| 3 | Between 6-4 months | 3 |
6.3%
|
| 4 | More than a year ago | 15 |
31.3%
|
| 5 | 5 | 3 |
6.3%
|
| Sysmiss | 2971 |