| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 month | 6 |
0.1%
|
| 2 | From 1 to 3 months | 8 |
0.2%
|
| 3 | From 3 to 6 months | 5 |
0.1%
|
| 4 | From 6 months to 1 year | 4 |
0.1%
|
| 5 | More than 1 year | 13 |
0.3%
|
| 98 | Don't know | 1 |
0%
|
| 99 | Refuse to answer | 1 |
0%
|
| Missing value | 4969 |
99.2%
|