| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months | 12 |
0.4%
|
| 2 | More than 12 months | 73 |
2.4%
|
| 98 | Don't know | 0 |
0%
|
| 99 | Refused to answer | 0 |
0%
|
| Missing value | 2970 |
97.2%
|