| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Within the last six months | 51 |
4.9%
|
| 2 | Between six and twelve months ago | 40 |
3.8%
|
| 3 | More than a year ago | 957 |
91.3%
|
| 9 | Don't know | 0 |
0%
|