Table 2 Polysomnographic characteristics according to positional and REM dependency-sleep architecture.

From: Comparison of polysomnographic and cephalometric parameters based on positional and rapid eye movement sleep dependency in obstructive sleep apnea

Variable

Positional dependency

REM dependency

Positional (n = 111)

Non-positional (n = 22)

P value

REM-related (n = 53)

Not-REM-related (n = 80)

P value

Total sleep time (mins)

326.8 ± 62.0

290.3 ± 66.1

0.014*

330.2 ± 53.9

314.5 ± 69.4

0.165

Sleep efficiency (%TST)

81.6 ± 10.7

75.7 ± 15.9

0.106

83.5 ± 10.2

78.7 ± 12.5

0.016*

Sleep latency (mins)

15.1 ± 14.3

21.2 ± 24.5

0.110

12.7 ± 10.6

18.3 ± 19.1

0.032*

REM latency (mins)

118.0 ± 56.5

124.3 ± 70.4

0.647

123.9 ± 59.8

115.8 ± 58.3

0.438

Sleep stage I (%TST)

26.8 ± 12.4

34.4 ± 25.5

0.187

18.7 ± 7.6

34.3 ± 16.2

 < 0.001*

Sleep stage II (%TST)

48.8 ± 12.6

44.6 ± 21.1

0.368

55.1 ± 11.4

43.5 ± 14.3

 < 0.001*

Sleep stage III + IV (%TST)

2.8 ± 5.7

1.2 ± 2.7

0.219

3.3 ± 5.2

2.0 ± 5.4

0.172

REM sleep (%TST)

17.4 ± 6.8

14.3 ± 7.1

0.058

18.3 ± 6.7

15.9 ± 6.9

0.042*

Time of supine position (% TST)

72.1 ± 25.2

74.1 ± 22.5

0.720

77.8 ± 23.8

68.8 ± 24.8

0.040*

REM arousal index

15.0 ± 13.2

25.9 ± 17.3

0.013*

17.5 ± 12.4

16.3 ± 15.8

0.644

NREM arousal index

12.7 ± 13.0

25.1 ± 26.5

0.049*

5.9 ± 5.5

21.1 ± 18.8

 < 0.001*

Respiratory arousal index

15.2 ± 13.5

30.2 ± 28.4

0.023*

8.6 ± 7.0

23.6 ± 20.0

 < 0.001*

Snoring arousal index

4.4 ± 3.6

3.2 ± 3.1

0.139

4.6 ± 3.5

3.9 ± 3.6

0.326

Spontaneous arousal index

3.9 ± 3.4

2.9 ± 3.0

0.219

3.4 ± 3.1

3.9 ± 3.6

0.397

Total arousal index

28.1 ± 12.8

38.5 ± 25.9

0.080

21.3 ± 8.6

35.5 ± 17.4

 < 0.001*

  1. REM, rapid eye movement sleep; TST, total sleep time; NREM, non-rapid eye movement sleep.
  2. aResults were obtained from independent T-test: mean ± SD.
  3. *Significant difference: p < 0.05.
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