Exposure-response relation for vibration-induced white finger: effect of different methods for predicting prevalence

Area of Science:

• Occupational Health
• Epidemiology
• Biostatistics

Background:

• Vibration-induced white finger (VWF) is a significant occupational health concern.
• Existing meta-analyses provide data on VWF prevalence across worker populations.
• International standards, like ISO 5349-1:2001, offer exposure-response relations for hand-arm vibration.

Purpose of the Study:

• To perform a pooled analysis of VWF prevalence using existing meta-analysis data.
• To compare different prevalence interpolation methods (linear and polynomial) with the ISO exposure-response relation.
• To refine the understanding of VWF risk assessment for hand-transmitted vibration exposure.

Main Methods:

• Pooled analysis of VWF prevalence data from published studies.
• Transformation of observed prevalences to a 10% benchmark using linear and polynomial interpolation.
• Regression analysis to construct an exposure-response relation for time to reach 10% VWF prevalence.
• Comparison of derived relations with the ISO 5349-1:2001 standard.

Main Results:

• Both linear and polynomial interpolation methods provided good fits to the data.
• Polynomial interpolation suggested slightly higher lifetime exposures for 10% VWF prevalence compared to linear interpolation.
• The 95% confidence intervals of the derived exposure-response relations encompassed the ISO exposure-response relation.
• The ISO standard provides a conservative estimate for VWF development at A(8) > 4 m/s2.

Conclusions:

• The ISO 5349-1:2001 exposure-response relation remains appropriate for assessing hand-transmitted vibration in the workplace.
• Combining linear and polynomial interpolation methods suggests the ISO relation is conservative.
• Further research is needed to address inconsistencies in the ISO method for calculating daily vibration exposures.