| Value | Category | Cases | |
|---|---|---|---|
| 1 | 75% drift reduction | 14 |
27.5%
|
| 2 | other. specify: | 6 |
11.8%
|
| 3 | 90% drift reduction | 16 |
31.4%
|
| 4 | 50% drift reduction | 15 |
29.4%
|
| Sysmiss | 98 |