| Value | Category | Cases | |
|---|---|---|---|
| 0 | <12 months | 428 |
15.1%
|
| 1 | 1 year | 236 |
8.3%
|
| 2 | 2 years | 329 |
11.6%
|
| 3 | 3 years | 295 |
10.4%
|
| 4 | 4 years | 170 |
6%
|
| 5 | 5 years | 270 |
9.5%
|
| 6 | 6+ years | 388 |
13.7%
|
| 7 | non-numeric | 598 |
21.1%
|
| 8 | don't know | 122 |
4.3%
|
| Sysmiss | 3919 |