| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 year | 218 |
11.9%
|
| 2 | 1 to 2 years | 105 |
5.7%
|
| 3 | Greater than 2 years | 496 |
27%
|
| 4 | Undecided | 835 |
45.4%
|
| 98 | Don't know | 185 |
10.1%
|
| Sysmiss | 2581 |