病棟内における騒音の客観的評価と主観的評価

概要

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We investigated about sound noise of a medical unit in a hospital in order to clarify the relation between an objective and a subjective assessment to the sound noise. The sound noises were recorded in a data recorder (RTR-50A, KYOWA) through a sound noise meter (NA-20, RION). Obtained data were digitized by a personal computer (PC-9801, NEC) with A/D converter (ADJ-98, Canopus), and analyzed through　a fast fourier transformation(FFT) by a bio-information analyzing software (BIMUTAS, Ver. 2.1E, KISSEI COMTEC). We assessed patients' subjective scores of "noisy level" by using a visual analog scale (VAS). In several sound noises, The median frequency was well correlated with the VAS value, although there was no correlation between the total power of sound noise and the VAS value. And, a back-ground noise was less and less, the VAS value became so large. These results suggest that patients' subjective scores of "noisy level" was alternated by a height (frequency) of sound noise and by a level of a surround back-ground noise.