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Table 4 Sleep parameters during NIV and during spontaneous breathing in study 2 patients

From: Sleep continuity: a new metric to quantify disrupted hypnograms in non-sedated intensive care unit patients

Parameters During NIV (number = 24) During SB (number = 24) P value
TST (minutes) 250 (166 to 330) 98 (42 to 176) 0.0003
Stage N1 (%) 6 (3 to 13) 15 (10 to 26) 0.003
Stage N2 (%) 36 (25 to 52) 49 (23 to 63) 0.6
Stage N3 (%) 38 (12 to 47) 6 (0 to 26) 0.003
REM (%) 13 (3 to 21) 1 (0 to 5) 0.005
Fragmentation (n/h) 26 (14 to 35) 39 (28 to 58) 0.002
  1. Fragmentation, number of arousals and awakenings per hour of sleep. Values are median (25th to 75th percentiles). P values from the Wilcoxon rank test. NIV: non-invasive ventilation; REM: rapid eye movement sleep; SB: spontaneous breathing; TST, total sleep time.