| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 2 years | 7 |
13.2%
|
| 2 | 2 or more years | 45 |
84.9%
|
| 98 | Don't know | 1 |
1.9%
|
| 99 | Refused | 0 |
0%
|
| Sysmiss | 351 |