Association between HAV exposure to rock drills and impact wrenches as separate variables and VPTs on dominant second finger: elevated VPT (dB) per 10-fold increase in days exposed to daily vibration in m/s2(A8)
| Frequency | Rock drill exposure: 5.4 m/s2(A8) Dominant second finger (n=104) | Impact wrench exposure: 1.2 m/s2(A8) Dominant second finger (n=104) |
| Hz | Unstandardised coefficient B (95% CI) | Unstandardised coefficient B (95% CI) |
| 8 | 2.08 (0.96 to 3.20)* | 0.91 (−0.05 to 1.87) |
| 16 | 1.96 (0.99 to 2.94)* | 1.03 (0.20 to 1.87)* |
| 32 | 1.86 (0.91 to 2.81)* | 0.88 (0.07 to 1.69)* |
| 64 | 2.23 (0.88 to 3.58)* | 1.01 (−0.15 to 2.17) |
| 125 | 2.65 (1.28 to 2.83)* | 1.27 (0.10 to 2.44)* |
| 250 | 3.40 (1.74 to 5.06)* | 1.70 (0.28 to 3.12)* |
| 500 | 3.36 (1.50 to 5.21)* | 0.74 (−0.85 to 2.33) |
Models included age (using categories of age <60 and ages 60–69 years), rock drill exposure and impact wrench exposure.
*P≤0.05.
HAV, hand–arm vibration; VPT, vibration perception threshold.