| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | Manual | 508 | 1373 |
38.7%
|
| 2 | Special tools | 11 | 26 |
0.7%
|
| 3 | Both methods | 20 | 67 |
1.9%
|
| Sysmiss | 380 | 2087 |