| Value | Category | Cases | |
|---|---|---|---|
| 1 | within past 2 yrs | 60 |
48%
|
| 2 | more than 2 yrs ago | 35 |
28%
|
| 3 | never | 29 |
23.2%
|
| 77 | don't know | 1 |
0.8%
|
| Sysmiss | 1170 |