| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 year | 40 |
9.1%
|
| 2 | 1 to 2 years | 44 |
10%
|
| 3 | Greater than 2 years | 83 |
18.8%
|
| 4 | Undecided | 190 |
43.1%
|
| 98 | Don't know | 84 |
19%
|
| Sysmiss | 36451 |