| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1 year or less | 132 |
18.5%
|
| 2 | Between 1 and 2 years | 87 |
12.2%
|
| 3 | More than 2 years | 118 |
16.5%
|
| 4 | never | 352 |
49.2%
|
| 7 | Do not remember | 5 |
0.7%
|
| 9 | Don't know | 21 |
2.9%
|
| Sysmiss | 566 |