| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 3635 |
73.1%
|
| 2 | One | 1247 |
25.1%
|
| 3 | Two | 68 |
1.4%
|
| 4 | Three or more | 21 |
0.4%
|
| Sysmiss | 20143 |