| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes, primary only | 414 |
4.6%
|
| 2 | yes,secondary only | 306 |
3.4%
|
| 3 | yes, both | 23 |
0.3%
|
| 4 | none | 8350 |
91.8%
|
| Sysmiss | 14228 |