| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1.Once | 263 |
8.8%
|
| 2 | 2.Twice | 1465 |
49.1%
|
| 3 | 3.More than twice | 1254 |
42%
|
| 9 | 9.MISSING | 1 |
0%
|
| Sysmiss | 410 |