| Value | Category | Cases | |
|---|---|---|---|
| -999999999 | 610 |
18.9%
|
|
| 1 | Training less than 1 year ago | 44 |
1.4%
|
| 2 | Training one year or more ago | 145 |
4.5%
|
| 3 | Never trained | 2423 |
75.2%
|