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Link between the 664 procedures included in this evaluation, 447 (67.3%) were in period 1 and 217 (32.7%) in phase 2. The noise amounts in the operating space were diminished by 3.8 dB(A) from 54.6 ± 4.5 dB(A) in phase 1 to 50.8 ± 2.8 dB(A) in stage 2 after intervention aided by the comments unit (P less then .001). Throughout the processes, there clearly was an increase of 0.7 dB(A) (P less then .001), with mean sound quantities of 53.5 dB(A) at the start