Results (in per cent) of the timed Allen test in 122 car mechanics with a diagnosis of VWF and 171 car mechanics without white finger
| Refill time (seconds) | |||
|---|---|---|---|
| ⩽6 | 6.5–20 | >20 | |
| Mechanics with white finger with cause other than vibrations were excluded. Note that the latter group were exposed to hand-arm vibrations too, and had neurological symptoms. The results for the left hands were similar. All differences between groups with and without VWF were highly significant (p<0.001). | |||
| Subjects with VWF | |||
| Right radial | 39 | 39 | 22 |
| Right ulnar | 25 | 49 | 26 |
| Subjects without VWF | |||
| Right radial | 67 | 25 | 8 |
| Right ulnar | 61 | 30 | 9 |