| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 year | 0 |
0%
|
| 2 | 1 to 2 years | 0 |
0%
|
| 3 | Greater than 2 years | 18 |
94.7%
|
| 4 | Undecided | 0 |
0%
|
| 98 | Don't know | 1 |
5.3%
|
| Sysmiss | 2170 |