| Value | Category | Cases | |
|---|---|---|---|
| -998 | Dont know | 0 |
0%
|
| -888 | Other specify | 0 |
0%
|
| 1 | From 9 months to 5 years | 0 |
0%
|
| 2 | Every 6 months | 7 |
100%
|
| Sysmiss | 124 |