The backrest should offer firm support, especially in the lumbar (lower back) region, should be 12- 19 inches wide, and should be easily adjustable both in angle and height, while sitting. The optimum angle between seat and back should permit a working posture of at least 90 degrees between the spine and thighs.
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ovsum - (no access) - 6-ERGO-CTD.pdf, p50
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