Table 1 Baseline characteristics of the sleep study cohort according to the AHI.

From: A novel parameter is better than the AHI to assess nocturnal hypoxaemia and excessive daytime sleepiness in obstructive sleep apnoea

 

Whole population

Normal (n = 13)

Mild OSA (n = 30)

Moderate OSA (n = 19)

Severe OSA (n = 98)

χ2/F

P value

Sex, n (%)

     

12.264

0.007

Men

111 (69.4)

5 (38.5)

19 (63.3)

10 (52.6)

77 (78.6)

  

Women

49 (30.6)

8 (61.5)

11 (36.7)

9 (47.4)

21 (21.4)

  

Age, year

40.44 \(\pm\) 15.08

25.92 \(\pm 9.95\)

38.40 \(\pm\) 13.96a

41.21 \(\pm\) 15.95a

\(42.85\pm\) 14.81a

5.476

0.001

BMI, kg/m2

32.91 \(\pm\) 9.46

32.00 \(\pm\) 8.47

30.91 \(\pm\) 9.17

32.19 \(\pm\) 9.17

33.78 \(\pm\) 9.40

0.795

0.499

NC, cm

42.59 \(\pm\) 5.09

38.38 \(\pm\) 3.01

41.12 \(\pm\) 4.86

40.68 \(\pm\) 3.66

43.97 \(\pm\) 5.10abc

8.061

 < 0.001

SBP, mmHg

128.30 \(\pm\) 18.85

114.46 \(\pm\) 16.64

124.03 \(\pm\) 16.60

123.32 \(\pm\) 17.50

132.41 \(\pm\) 18.87abc

5.227

0.002

DBP, mmHg

81.86 \(\pm\) 13.86

71.38 \(\pm\) 11.52

78.40 \(\pm\) 12.48

78.79 \(\pm\) 9.42

84.90 \(\pm\) 14.36ab

5.388

0.001

Hypertension, n (%)

     

15.983

 < 0.001

No

101 (63.1)

12 (92.3)

24 (80.0)

14 (73.7)

51 (52.0)

  

Yes

59 (36.9)

1 (7.7)

6 (20.0)

5 (26.3)

47 (48.0)

  

Diabetes, n (%)

     

- d

0.476

No

142 (88.7)

13 (100.0)

26 (93.3)

14 (84.2)

84 (86.7)

  

Yes

18 (11.3)

0 (0)

2 (6.7)

3 (15.8)

13 (13.3)

  

ESS

8.00 (4.00,11.00)

6.00 (1.50.8.00)

6.00 (2.75,9.25)

9.00 (7.00,12.00)a

8.00 (4.00,12.00)

8.179

0.042

AHI, /h

50.45 (13.38,70.73)

1.50 (0.75,3.10)

9.25 (6.65,11.35)a

22.20 (19.00,27.00)ab

67.00 (53.78,88.18)abc

121.072

 < 0.001

AHT%

30.04 (7.91,50.23)

0.70 (0.30,1.23)

4.85 (3.04,5.73)a

12.68 (10.65,13.77)ab

46.54 (32.99,58.69)abc

120.847

 < 0.001

Min SpO2, %

91.85 \(\pm\) 4.97

96.26 \(\pm\) 0.65

95.26 \(\pm\) 1.08

94.61 \(\pm\) 1.39

89.69 \(\pm\) 5.23abc

23.011

0.001

CT90%

12.78 (0.94,35.59)

0.0 (0.0,0.05)

0.36 (0.08,1.46)a

2.74 (0.65,4.82)ab

29.58 (14.80,52.32)abc

107.318

 < 0.001

  1. AHI apnoea-hypopnoea index; OSA obstructive sleep apnoea; BMI body mass index; NC neck circumference; SBP systolic blood pressure; DBP diastolic blood pressure; ESS Epworth Sleepiness Scale; AHT% the percentage of total sleep time spent with apnoea and hypoponea duration time; Min SpO2 minimum nocturnal oxygen saturation; CT90% percentage of total sleep time with an oxygen saturation of < 90%.
  2. a,b,cThe differences were statistically significant compared with the normal, mild and moderate AHI groups, respectively (P < 0.05).
  3. dFisher’s exact probability was used.
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