| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | Manual | 257 | 799 |
24.3%
|
| 2 | Special tools | 8 | 9 |
0.3%
|
| 3 | Both methods | 12 | 16 |
0.5%
|
| Sysmiss | 583 | 2459 |