| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | Manual | 302 | 779 |
21.9%
|
| 2 | Special tools | 12 | 16 |
0.5%
|
| 3 | Both methods | 17 | 38 |
1.1%
|
| Sysmiss | 588 | 2718 |