| Value | Category | Cases | |
|---|---|---|---|
| -999999999 | 610 |
18.9%
|
|
| 1 | Training less than 1 year ago | 88 |
2.7%
|
| 2 | Training one year or more ago | 173 |
5.4%
|
| 3 | Never trained | 2351 |
73%
|