| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don?t know | 1 |
0.8%
|
| 0 | Less than 1 month | 0 |
0%
|
| 2 | 2 |
1.7%
|
|
| 3 | 2 |
1.7%
|
|
| 4 | 1 |
0.8%
|
|
| 6 | 87 |
72.5%
|
|
| 7 | 27 |
22.5%
|