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Table 1 Characteristics of healthy subjects in the baseline night of simulated ICU noise and light (Baseline NL)

From: Effect of oral melatonin and wearing earplugs and eye masks on nocturnal sleep in healthy subjects in a simulated intensive care unit environment: which might be a more promising strategy for ICU sleep deprivation?

Variable NI NIP NLEE NLM P
Age 42.8 ± 11.8 39.7 ± 11.6 40.1 ± 12.7 42.0 ± 12.8 0.930
Gender (percent female) 0.4 0.5 0.5 0.6 0.849
Time in bed (min) 520.6 ± 17.0 509.1 ± 16.4 511.8 ± 17.8 510.9 ± 26.6 0.580
Total sleep time (min) 349.2 ± 28.4 354.0 ± 22.6 354.2 ± 20.7 348.6 ± 22.0 0.922
Sleep efficiency index 0.69 ± 0.08 0.75 ± 0.08 0.72 ± 0.07 0.75 ± 0.05 0.164
REM (%) 16.6 ± 3.6 16.5± 6.3 18.5 ± 3.5 19.3 ± 4.1 0439
N1 (%) 17.7 ± 3.9 18.8 ± 3.3 19.6 ± 2.3 19.6 ± 3.2 0.530
N2 (%) 47.9 ± 6.3 47.5 ± 7.1 46.2 ± 1.6 43.6 ± 3.4 0.259
N3 (%) 15.8 ± 3.5 17.2 ± 4.9 15.7 ± 2.8 17.5 ± 3.5 0.620
Sleep onset latency (min) 58.4 ± 15.5 54.3 ± 15.3 53.2 ± 16.9 46.9 ± 11.0 0392
REM latency (min) 166.6 ± 38.8 140.4 ± 29.3 159.5 ± 30.0 154.4 ± 37.5 0381
No. of awakenings 14.4 ± 3.3 14.4 ± 3.1 13.5 ± 2.8 13.8 ± 3.0 0.885
Sleep arousals index 8.7 ± 3.3 8.4 ± 2.4 8.2 ± 1.3 8.4 ± 2.1 0.981
State anxiety 46.0 ± 8.8 45.2 ± 7.7 44.4 ± 5.9 45.0 ± 5.9 0.968
Sleep quality 6.1 ± 1.0 5.9 ± 1.0 6.1 ± 1.3 6.2 ± 1.4 0.952
  1. NL: simulated ICU noise and light; NLP: NL plus placebo; NLM: NL plus melatonin; NLEE: NL plus use of earplugs and eye masks.