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Table 3 Sleep characteristics in heart failure patients with and without sleep apnoea

From: Prevalence and characteristics of sleep apnoea in patients with stable heart failure: Results from a heart failure clinic

  Total (N = 103) With SA (N = 75) Without SA (N = 28) p value
AHI (n/h) 10.4 (4.6-30.5) 17.6 (9.3-42.5) 1.9 (0.6-4.1) < 0.001
Total sleep time (TST, min) 246.0 (189.5-333.0) 246.2 (189.5-334.0) 222.0 (131.5-301.5) 0.34
Sleep (% TST)     
   Stage 1 15.5 (10.0-23.4) 17.5 (12.7-27.4) 11.6 (5.4-15.3) < 0.001
   Stage 2 60.4 (49.8-71.2) 60.4 (50.3-72.0) 60.9 (46.6-70.4) 0.58
   Stages 3 and 4 10.9 (1.0-20.3) 6.9 (0.3-15.1) 19.3 (13.4-31.5) < 0.001
   REM 8.0 (3.1-12.7) 8.4 (3.8-13.1) 6.4 (0.0-10.9) 0.17
   NREM 92.1 (87.4-97.2) 91.6 (87.1-96.4) 93.6 (89.100.0) 0.22
Arousals (n/h) 6.1 (3.1-10.4) 7.2 (4.0-11.0) 3.8 (1.0-7.3) 0.02
Mean SO2 (%) 93.0 (91.0-95.0) 93.0 (90.0-94.0) 94.0 (92.0-96.0) 0.02
Lowest SO2 (%) 81.0 (76.0-85.0) 81.0 (71.2-85.0) 85.0 (79.0-88.0) 0.006
SO2 < 90% (% TST) 7.7 (2.0-27.6) 15.6 (3.7-39.8) 2.0 (0.2-6.2) < 0.001
  1. AHI- apnoea-hypopnoea index; SO2- oxyhemoglobin saturation.
  2. Continuous data are expressed as median and interquartile range.