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Table 3 Sound characteristics (11 subjects)

From: Sound level intensity severely disrupts sleep in ventilated ICU patients throughout a 24-h period: a preliminary 24-h study of sleep stages and associated sound levels

Sound values 24-h night and day sleep Day (08h00–22h00) Night (22h00–08h00) Day vs. night p
Sound level, dBC 72.2 [65.1–80.2] 74.2 [68.1–80.2] 70.2 [65.1–80.3] 0.01
Sound typology
 Alarm, n/h 38 [25–51] 22 [14–24] 18 [15–23] NS
 Mechanical respirators, n/h 101 [50–120] 55 [38–57] 49 [41–62] NS
 Talking; staff conversations, n/h 28 [10–53] 26 [9–43] 5 [4–15] 0.02
 Other, n/h 15 [7–25] 10 [3–17] 7 [4–10] NS