| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1 year or less | 364 |
50.9%
|
| 2 | Between 1 and 2 years | 96 |
13.4%
|
| 3 | More than 2 years | 136 |
19%
|
| 4 | never | 75 |
10.5%
|
| 7 | Do not remember | 18 |
2.5%
|
| 9 | Don't know | 26 |
3.6%
|
| Sysmiss | 566 |