Rater reliability and concurrent validity of the Keyboard Personal Computer Style instrument (K-PeCS).
Baker-NA; Cook-JR; Redfern-MS
Appl Ergon 2009 Jan; 40(1):136-144
This paper describes the inter-rater and intra-rater reliability, and the concurrent validity of an observational instrument, the Keyboard Personal Computer Style instrument (K-PeCS), which assesses stereotypical postures and movements associated with computer keyboard use. Three trained raters independently rated the video clips of 45 computer keyboard users to ascertain inter-rater reliability, and then re-rated a sub-sample of 15 video clips to ascertain intra-rater reliability. Concurrent validity was assessed by comparing the ratings obtained using the K-PeCS to scores developed from a 3D motion analysis system. The overall K-PeCS had excellent reliability [inter-rater: intra-class correlation coefficients (ICC)=.90; intra-rater: ICC=.92]. Most individual items on the K-PeCS had from good to excellent reliability, although six items fell below ICC=.75. Those K-PeCS items that were assessed for concurrent validity compared favorably to the motion analysis data for all but two items. These results suggest that most items on the K-PeCS can be used to reliably document computer keyboarding style.
Posture; Ergonomics; Biomechanics; Models; Biomechanics; Biomechanical-modeling; Skeletal-movement; Statistical-analysis; Mathematical-models; Computer-equipment; Computers; Equipment-design; Equipment-operators;
Author Keywords: VDT evaluation; MSD-UE; Instrument development
Nancy A. Baker, Department of Occupational Therapy, University of Pittsburgh, 5012 Forbes Tower, Pittsburgh, PA 15260
University of Pittsburgh