| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1 year or less | 320 |
44.8%
|
| 2 | Between 1 and 2 years | 117 |
16.4%
|
| 3 | More than 2 years | 186 |
26%
|
| 4 | never | 66 |
9.2%
|
| 7 | Do not remember | 12 |
1.7%
|
| 9 | Don't know | 14 |
2%
|
| Sysmiss | 566 |