| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 year | 74 |
10%
|
| 2 | 1 to 2 years | 51 |
6.9%
|
| 3 | Greater than 2 years | 183 |
24.7%
|
| 4 | Undecided | 351 |
47.4%
|
| 98 | Don't know | 81 |
10.9%
|
| Sysmiss | 962 |