Quantitative noise analysis in a modern hospital.

Quantitative noise analysis of a general surgical ward in a modern hospital showed that the level of noise was in excess of recommended levels and of sufficient intensity to disturb sleep. Individual noises in excess of 50 dB(A) were recorded in every area at all times of the day. Internal hospital sounds were responsible for most noise; staff and audible warning devices were the main sources of noise over 70 dB(A). Octave waveband analysis showed that both the general ward noise and the noise of the air conditioning were in excess of recommended levels.