| Value | Category | Cases | |
|---|---|---|---|
| 1 | within past yr | 42 |
33.6%
|
| 2 | more than 1 yr ago | 19 |
15.2%
|
| 3 | never | 63 |
50.4%
|
| 77 | don't know | 1 |
0.8%
|
| Sysmiss | 1170 |