The prevalence of musculoskeletal disorder and the association with risk factors among auto repair mechanics in Klang Valley, Malaysia

Background: The primary objective of this study was to determine the association between risk factors and the prevalence of musculoskeletal disorder (MSD) among auto repair mechanics in Klang Valley, Malaysia. Methods: Overall, 191 mechanics from eight auto repair centers in Klang Valley, Malaysia were stratified sampling as participants of this study. A modified version of the general Standardized Nordic Questionnaire was used for analyses of perceived MSD in nine different parts of the body. Rapid Upper Limb Assessment (RULA), vibration measurement on hand power tool, questionnaire on job content, force exertion was used in this study. Direct logistic regression was performed to assess the impact of risk factors on the MSD prevalence. The probability limits for evaluating statistical significance was P < 0.05. Results: 87.4% of auto repair mechanics suffered from MSD. Logistic regression analysis revealed that factors were associated with symptoms on MSD: RULA (7.933, 95% CI 4.637-13.573) and orceful exertion (3.173, 95% CI 1.194 – 8.432). The magnitude of vibration of power tool exceeds action level 2.5m/s2 with (Mean=3.99+S.E. 0.071) and showed significant association with MSD in this study (P