| Value | Category | Cases | |
|---|---|---|---|
| 1 | ONLY ONCE | 16998 |
65.4%
|
| 2 | MORE THAN ONCE | 2866 |
11%
|
| 9 | NO RESPONSE | 14 |
0.1%
|
| Sysmiss | 6124 |
23.6%
|