title: Lost time back injuries: their rrelationship to heavy work and preplacement back x-rays.
mesh_terms: D000041:Absenteeism; D000328:Adult; D019567:Back Injuries; D005260:Female; D006801:Humans; D008297:Male; D008487:Medical History Taking; D008875:Middle Aged; D009515:New Jersey; D009784:Occupational Diseases / Q000209:etiology / Q000517:prevention & control*; D009787:Occupational Medicine; D010808:Physical Examination; D005082:Physical Exertion; D011859:Radiography; D013131:Spine / Q000000981:diagnostic imaging; D014937:Work