| Value | Category | Cases | |
|---|---|---|---|
| 2 | 2 years or more | 698 |
79.4%
|
| 3 | about a year | 24 |
2.7%
|
| 4 | more than 1 year but less than 2 years | 74 |
8.4%
|
| 5 | more than 6 months but less than 1 year | 20 |
2.3%
|
| 6 | six months or less | 63 |
7.2%
|
| Sysmiss | 1737 |