| Value | Category | Cases | |
|---|---|---|---|
| -999999999 | 609 |
18.9%
|
|
| 1 | Training less than 1 year ago | 99 |
3.1%
|
| 2 | Training one year or more ago | 177 |
5.5%
|
| 3 | Never trained | 2337 |
72.5%
|