| Value | Category | Cases | |
|---|---|---|---|
| 1 | Up to six months ago | 1 |
2.3%
|
| 2 | Over 6 months ago but up to one year ago | 5 |
11.4%
|
| 3 | Over a year ago, but less than 2 years ago | 12 |
27.3%
|
| 4 | 2 years or more ago but less than 5 years ago | 12 |
27.3%
|
| 5 | 5 years ago or more | 12 |
27.3%
|
| 6 | Do not know/Can not remember | 2 |
4.5%
|
| Sysmiss | 12436 |