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Table 1 Demographic characteristics of OSA patients

From: More severe hypoxemia is associated with better subjective sleep quality in obstructive sleep apnea

Characteristics, (n = 156)

Mean (SD)

Gender-male (n, %)

118 (75.6 %)

Age(years)

47.3(14.0)

BMI (Kg/m2)

27.3 (4.5)

Total sleep time (min)

355.0(61.8)

Sleep efficiency(%)

83.2(12.6)

Sleep latency(min)

14.3(19.7)

Stage I (%)

23.8(19.4)

Stage II (%)

51.3(13.5)

Stage III (%)

11.3(10.4)

Stage REM (%)

13.5(6.7)

AHI (/hour)

35.0(25.9)

Mean SpO2 (%)

94.7(2.4)

Mini SpO2 (%)

77.5(10.4)

ODI (/hour)

30.7(24.7)

T90 (second/hour)

445.6(571.5)

Arousal index (/hour)

31.8(23.4)

PLMI (/hour)

0.4(0.8)

PSQI (scale)

9.4(4.3)

ESS (scale)

11.2(5.3)

SF-36 physical (scale)

46.8(9.2)

SF-36 mental (scale)

41.3(11.6)

CESD (n = 36)

18.0(11.0)

HADS-depression(n = 120)

6.5(3.8)

Median SpO2 (%)

94.9(2.6)

Lowest 5 % SpO2 (%)

81.4(9.4)

Highest 5 % SpO2 (%)

98.2(0.9)

Hightest 5 % SpO2 minus Median SpO2

3.28(2.28)

Median SpO2 minus Lowest 5 % SpO2 (%)

13.5(8.3)

  1. Abbreviations: BMI body mass index; REM rapid eye movement sleep; AHI apnea-hypopnea index; Mean SpO2 mean saturation of total time in bed; Mini SpO2 minimum saturation of total time in bed; ODI oxygen desaturation index; T90 time spent with saturation < 90 %; PLMI periodic leg movement index; PSQI Pittsburgh sleep quality index; ESS Epworth sleepiness scale; SF-36 Physical, physical component score of short form 36; SF-36 Mental, mental component score of short form 36; CESD center for epidemiologic studies depression scale; HADS-depression depression component of Hospital Anxiety and Depression Scale; median SpO2 the median value of saturation of total sleep time; Lowest 5 % SpO2 averaged value from the lowest 5 % saturation of total sleep time; Highest 5 % SpO2, averaged value from the highest 5 % saturation of total sleep time; Highest% SpO2 minus Medium SpO2, the difference between Highest 5 % SpO2 and Medium SpO2; Median SpO2 minus Lowest 5 % SpO2, the difference between Median SpO2 and Lowest 5 % SpO2