| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 year | 386 |
11.5%
|
| 2 | 1 to 2 years | 165 |
4.9%
|
| 3 | Greater than 2 years | 901 |
26.8%
|
| 4 | Undecided | 1581 |
47.1%
|
| 98 | Don't know | 325 |
9.7%
|
| Sysmiss | 4126 |