Table 1 Demographic, clinical, and polysomnographic characteristics of subjects.

From: Difference in spectral power density of sleep EEG between patients with simple snoring and those with obstructive sleep apnoea

Variable

SS (n = 42)

OSA (n = 129)

Statistics‡

Demographics

   Age, years

44.2 ± 12.4

46.4 ± 11.0

t = –1.04, p = 0.299

   Sex, male

34 (81.0%)

110 (85.3%)

χ2 = 0.44, p = 0.505

   Body mass index, kg/m2

24.2 ± 2.9

26.2 ± 3.5

t = –3.36, p = 0.001

Polysomnographic data

  Sleep and wake time

   Time in bed, min

416.8 ± 26.3

410.7 ± 30.0

t = 1.19, p = 0.237

   Total sleep time, min

340.2 ± 57.0

337.8 ± 55.8

t = 0.24, p = 0.809

   Sleep latency, min

13.4 ± 19.5

13.4 ± 22.6

t = 0.00, p = 0.996

   Sleep efficiency, %

81.9 ± 14.5

82.2 ± 13.3

t = –0.11, p = 0.914

   WASO, min

63.3 ± 58.7

58.8 ± 45.0

t = 0.55, p = 0.584

   REM sleep latency, min

132.5 ± 71.4

124.3 ± 62.6

t = 0.72, p = 0.475

  Sleep stage, %

   N1

18.1 ± 9.1

30.5 ± 16.3

t = –6.18, p < 0.001

   N2

61.3 ± 8.9

50.3 ± 14.8

t = 5.82, p < 0.001

   N3

4.3 ± 6.3

3.1 ± 5.3

t = 0.13, p = 0.202

   R

16.3 ± 7.0

15.6 ± 7.2

t = 0.66, p = 0.596

  Respiration

   AHI, event per hour

1.8 ± 1.4

31.7 ± 21.2

t = –15.92, p < 0.001

   Arousal index

17.76 ± 8.36

35.47 ± 17.98

t = –8.67, p < 0.001

  1. Data are mean ± standard deviation or n (%) values. ‡Independent t test or χ2 test; SS, simple snoring; OSA, obstructive sleep apnoea; WASO, wake time after sleep onset; REM, rapid eye movement; N1, non-REM (NREM) stage 1; N2, NREM stage 2; N3, NREM stage 3; R, REM stage; AHI, apnoea hypopnoea index.
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