Incidence rate and number of injuries and illnesses due to musculoskeletal disorders, selected occupations, 2007 Occupation MSD rate MSD cases Nursing aides, orderlies 252 24,340 Emergency medical personnel 179 2,230 Laborers and material movers 149 27,040 Ticket agents and travel clerks 132 1,900 Truck drivers, light 117 10,460 Truck drivers, heavy 101 16,470