| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| 0 | Less than 1 month | 1 |
1.5%
|
| 6 | 41 |
61.2%
|
|
| 7 | 22 |
32.8%
|
|
| 8 | 1 |
1.5%
|
|
| 12 | 2 |
3%
|