| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don?t know | 0 |
0%
|
| 0 | Less than 1 month | 0 |
0%
|
| 6 | 59 |
49.2%
|
|
| 7 | 28 |
23.3%
|
|
| 8 | 5 |
4.2%
|
|
| 9 | 9 |
7.5%
|
|
| 12 | 13 |
10.8%
|
|
| 18 | 2 |
1.7%
|
|
| 20 | 1 |
0.8%
|
|
| 24 | 3 |
2.5%
|