| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 month | 4 |
0.1%
|
| 2 | From 1 to 3 months | 2 |
0%
|
| 3 | From 3 to 6 months | 7 |
0.1%
|
| 4 | From 6 months to 1 year | 6 |
0.1%
|
| 5 | More than 1 year | 14 |
0.3%
|
| 98 | Don't know | 0 |
0%
|
| 99 | Refuse to answer | 1 |
0%
|
| Missing value | 4973 |
99.3%
|