Biomedical subjects
Publications and source records attributed to J D Floyd.
Back injuries devour one-third of health care benefits and workers' compensation, yet corporate strategies vary widely in their approach to back pain prevention, treatment and rehabilitation. These recommendations provide a benchmark for evaluation policies on low back pain. They emphasize a sports medicine approach, focused on returning workers to activity as soon as possible.
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Investigations into the methods used to calibrate audiometers reveal that the 6 000 Hz frequency is particularly liable to yield inconsistent results when calibrated in the usual way. It is shown that the TDH39 telephone receiver which is usually calibrated on a 9A coupler in accordance with the International Standards Organization recommendation R389 will depend to a considerable extent on the precise frequency used and may differ by as much as 7 db when the frequency is varied but still retained within the specified tolerance limits. A new telephone receiver, the TDH50, is much less sensitive to frequency variation. It is shown that this receiver should be calibrated with the same threshold figures as the TDH39.
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