Table 3 Polysomnographic characteristics according to positional and REM dependency- respiratory parameters.

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 AHIa

24.9 ± 18.2

43.1 ± 36.3

0.031*

17.2 ± 11.0

35.0 ± 26.2

 < 0.001*

Supine AHIa

33.3 ± 23.4

44.9 ± 37.7

0.177

20.7 ± 14.9

44.8 ± 28.1

 < 0.001*

Non-supine AHIa

6.0 ± 8.8

38.9 ± 35.6

 < 0.001*

6.0 ± 8.4

15.0 ± 24.9

0.004*

REM AHIa

33.1 ± 21.8

44.5 ± 28.6

0.036*

40.7 ± 18.4

31.2 ± 25.5

0.014*

NREM AHIa

23.0 ± 19.4

42.6 ± 38.2

0.028*

12.0 ± 9.3

35.7 ± 26.8

 < 0.001*

Severity groupb

32.4%

50.0%

0.115

13.2%

50.0%

 < 0.001*

Mean SpO2a

95.4 ± 1.7

94.1 ± 2.5

0.025*

95.8 ± 1.6

94.8 ± 2.0

0.004*

Lowest SpO2a

81.3 ± 9.2

77.1 ± 11.3

0.061

83.2 ± 7.3

78.8 ± 10.6

0.005*

Time below 90% SpO2 (%)a

4.0 ± 7.0

10.2 ± 14.2

0.059

1.6 ± 2.6

7.3 ± 10.7

0.000*

REM SpO2a

94.2 ± 9.4

92.7 ± 3.8

0.476

95.3 ± 1.9

93.1 ± 11.1

0.154

NREM SpO2a

95.4 ± 1.7

94.0 ± 2.8

0.028*

95.8 ± 1.6

94.8 ± 2.1

0.005*

  1. REM, rapid eye movement sleep; AHI, apnea–hypopnea index; NREM, non-rapid eye movement sleep.
  2. aResults were obtained from independent T-test: mean ± SD.
  3. bResults were obtained from Chi-square test.
  4. *Significant difference: p < 0.05.
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