| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| 0 | Less than 1 month | 0 |
0%
|
| 6 | 46 |
68.7%
|
|
| 7 | 20 |
29.9%
|
|
| 8 | 1 |
1.5%
|