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Table 4 Averages (SD) for five selected noise level parameters for each hospital individually (nighttime) and averages for all hospitals during 24 h, day time (7am - 11pm), and night (11pm - 7am)

From: Noise in the intensive care unit and its influence on sleep quality: a multicenter observational study in Dutch intensive care units

Auditory parameter Site 1 Site 2 Site 3 Site 4 Site 5 Site 6 Average
24 h Day Night
LAeq (dBA, SD) 46.3 (3.9) 47.1 (5.8) 51.7 (3.2) 51.5 (2.2) 49.8 (2.7) 50.7 (1.5) 54.0 (2.4) 55.1 (2.3) 49.2 (4.0)
L90 (dBA, SD) 35.9 (4.2) 37.8 (1.9) 42.0 (3.6) 43.6 (1.9) 36.2 (4.0) 40.0 (2.7) 38.1 (4.0) 39.1 (3.9) 38.4 (4.7)
Peaks10S (count, SD) 2.5 (3.3) 4.1 (4.3) 8.4 (7.0) 8.8 (6.2) 7.2 (6.6) 7.2 (4.1) 17.5 (8.0) 23.1 (10.1) 6.0 (6.1)
Average number of restorative periods (count, SD) 20.5 (5.9) 15.9 (8.6) 19.5 (4.8) 18.4 (5.4) 17.9 (7.7) 19.6 (6.2) 38.3 (12.5) 19.4 (9.5) 19.1 (6.4)
Average durations of restorative periods (min, SD) 12.6 (5.5) 11.6 (5.5) 17.6 (7.9) 10.6 (2.1) 15.1 (10.5) 13.8 (5.5) 12.9 (7.7) 11.4 (9.4) 14.1 (7.7)
  1. LAeq A-weighted time-averaged sound pressure level, dBA A-weighted decibel in ICU, L90 10th percentile sound pressure level (A-weighted on fast-response mode), Peak10S hourly rate of loudness peaks of at least 10 sone