| Value | Category | Cases | |
|---|---|---|---|
| -999999999 | 610 |
18.9%
|
|
| 1 | Training less than 1 year ago | 122 |
3.8%
|
| 2 | Training one year or more ago | 230 |
7.1%
|
| 3 | Never trained | 2260 |
70.1%
|