| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Month/year | 13258 |
99.6%
|
| 6 | 6. NOT APPLICABLE | 0 |
0%
|
| 8 | 8. Don't know | 48 |
0.4%
|
| 9 | 9. Missing | 0 |
0%
|
| Sysmiss | 4018 |