| Value | Category | Cases | |
|---|---|---|---|
| 1 | less than 1 year | 58 |
13.1%
|
| 2 | 1 year or more | 339 |
76.4%
|
| 3 | Don't remember | 0 |
0%
|
| 99 | 47 |
10.6%
|
|
| Sysmiss | 9270 |