| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 year | 2 |
16.7%
|
| 2 | 1 to 2 years | 0 |
0%
|
| 3 | Greater than 2 years | 6 |
50%
|
| 4 | Undecided | 0 |
0%
|
| 98 | Don't know | 4 |
33.3%
|
| Sysmiss | 1690 |