| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 year | 72 |
18.7%
|
| 2 | 1 year | 84 |
21.8%
|
| 3 | 2 years | 34 |
8.8%
|
| 4 | More than 2 years | 77 |
19.9%
|
| 5 | Missing | 98 |
25.4%
|
| 6 | Other | 16 |
4.1%
|
| 7 | Refusal | 1 |
0.3%
|
| 9 | Not Applicable | 4 |
1%
|