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Job Level Risk Assessment Using Task Level Strain Index Scores: A Pilot Study

Drinkaus P., Bloswick D. S., Sesek R., Mann C., Bernard T.

International Journal of Occupational Safety and Ergonomics

2005

Vol. 11, No. 2

141--152

This paper explores 2 methods of modifying the Strain Index (SI) to assess the ergonomic risk of multi-task jobs. Twenty-eight automotive jobs (15 cases and 13 controls) were studied. The first method is based on the maximum task SI score, and the second method is modeled on the NIOSH Composite Lifting Index (CLI) algorithm, named cumulative assessment of risk to the distal upper extremity (CARD). Significant odds ratios of 11 (CI 1.7–69) and 24 (CI 2.4–240) were obtained using the modified maximum task and CARD, respectively. This indicates that modification of the SI may be useful in determining the risk of distal upper extremity injury associated with a multi-task job.

Job Level Risk Assessment Using Task Level ACGIH Hand Activity Level TLV Scores: A Pilot Study

Drinkaus P., Sesek R., Bloswick D. S., Mann C., Bernard T.

International Journal of Occupational Safety and Ergonomics

2005

Vol. 11, No. 3

263--281

Existing upper extremity musculoskeletal disorder analytical tools are primarily intended for single or monotask jobs. However, many jobs contain more than 1 task and some include job rotation. This case/control study investigates methods of modifying an existing tool, the American Conference of Governmental Industrial Hygienists (ACGIH) Hand Activity Level (HAL) Threshold Limit Value (TLV), to assess the upper extremity risk of multi-task jobs. Various methods of combining the task differences and ratios into a job level assessment were explored. Two methods returned significant odds ratios, (p < .05) of 18.0 (95% CI 1.8–172) and 12.0 (95% CI 1.2–120). These results indicate that a modified ACGIH HAL TLV may provide insight into the workrelated risk of multi-task jobs. Further research is needed to optimize this process.