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Table 2 Sources of nocturnal noise in occurrences per hour in the ICU

From: The nocturnal acoustical intensity of the intensive care environment: an observational study

Source Mean occurrences per hour mean (SD) Proportion of total occurrences per hour (%)
Staff 84.38 (32.77) 35.5
Alarms 81.06 (43.95) 34.1
Other 35.81 (19.96) 15.1
Doors 12.88 (12.37) 5.4
Pumps 7.19 (12.55) 3.0
Equipment 6.06 (4.64) 2.6
Trolleys 5.94 (7.19) 2.5
Wash basins 4.13 (2.55) 1.7