| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 year | 0 |
0%
|
| 2 | 1 to 2 years | 1 |
6.3%
|
| 3 | Greater than 2 years | 4 |
25%
|
| 4 | Undecided | 2 |
12.5%
|
| 98 | Don't know | 9 |
56.3%
|
| Sysmiss | 2168 |