Upper Extremity Analysis of the Wrist - Fundamentals and Assessment Tools for Occupational Ergonomics - page 864

of unaccounted variance was thought to be due individual differences such as gender, age, physical
fitness, etc. and the psychosocial risk factors.
Novice ergonomists (university graduate students) required at least several trials in becoming profi-
cient with the risk assessment model. However, by the fifth trial, average time required for job analysis
had decreased to 12 min and test-retest reliability was up to r 2 0.99. A simplified version of this risk

index has been developed into a paper-and-pencil checklist for use in industry (see Figure 45.16), with

¼

FIGURE 45.16 A simple carpal tunnel disorder risk index (Reproduced from Niebel, B. and Freivalds, A. (2003).
Methods, Standards, and Work Design. New York: McGraw-Hill. With permission.)