| Value | Category | Cases | |
|---|---|---|---|
| -999999999 | 610 |
18.9%
|
|
| 1 | Training less than 1 year ago | 377 |
11.7%
|
| 2 | Training one year or more ago | 730 |
22.7%
|
| 3 | Never trained | 1505 |
46.7%
|