| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Month given correctly | 534 |
96.6%
|
| 2 | 2. Month give incorrectly/does not know | 18 |
3.3%
|
| 98 | 98. Refused | 1 |
0.2%
|
| Sysmiss | 446 |