| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 month | 575 |
11.5%
|
| 2 | From 1 to 3 months | 195 |
3.9%
|
| 3 | From 3 to 6 months | 93 |
1.9%
|
| 4 | From 6 months to 1 year | 36 |
0.7%
|
| 5 | More than 1 year | 805 |
16.1%
|
| 98 | Don't know | 35 |
0.7%
|
| 99 | Refuse to answer | 9 |
0.2%
|
| Missing value | 3259 |
65.1%
|