Validity of self-reported duration of work postures obtained by interview

The aim of the study was to validate interview data concerning the duration of four work postures (1) sitting, (2) standing/walking with hands above s houlder level, (3) standing/walking with hands between shoulder and knuckle level, and (4) standing/walking with hands below knuckle level. The self-r eported time spent in each posture was tested in relation to observations a nd technical measurements in 20 subjects during two full working days. The linear relationships between self-reports and observations were strong for the three postures; sitting (r(2) = 0.55), hands above shoulder level (r(2) = 0.58) and hands below knuckle level (r(2) = 0.69). Thus, using this inte rview technique, self-reports concerning time spent in (1) sitting, (2) sta nding/walking with hands above shoulder level and, (3) standing/walking wit h hands below knuckle level may be accurate enough for studying these work postures in epidemiological studies. (C) 1999 Elsevier Science Ltd. All rig hts reserved.