| Value | Category | Cases | |
|---|---|---|---|
| 0 | Did not change | 0 |
0%
|
| 1 | Once | 1060 |
74.6%
|
| 2 | Twice | 295 |
20.8%
|
| 3 | Thrice or more | 64 |
4.5%
|
| 999 | 1 |
0.1%
|
|
| Sysmiss | 1527 |