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Table 5 Comparison of statistic results of demographic, anthropometric, questionnaire, and PSG variables between patients whose TST < 4 h and those with TST ≥ 4 h

From: Validation of overnight oximetry to diagnose patients with moderate to severe obstructive sleep apnea

Severitya

All

TST < 4 h

TST ≥ 4 h

Statistic test (p)b

AHI**

34.07 ± 28.11

43.52 ± 26.81

32.74 ± 28.06

0.002

Severity†

616 (100%)

76 (12.34%)

540 (87.66%)

 

Normal

72 (11.7%)

4 (5.3%)

68 (12.6%)

χ2 = 15.4

Mild

127 (20.6%)

6 (7.9%)

121 (22.4%)

p < 0.01

Moderate

132 (21.4%)

18 (23.9%)

114 (21.1%)

Severe

285 (46.3%)

48 (63.2%)

237 (43.9%)

Age**

45.2 ± 12.7

52.20 ± 14.67

44.17 ± 12.16

0.001

BMI

26.74 ± 4.24

27.14 ± 4.37

26.68 ± 4.22

0.370

NC

39.08 ± 3.65

39.65 ± 3.56

39.06 ± 3.42

0.161

ESS

9.21 ± 5.24

9.43 ± 5.48

9.19 ± 5.22

0.599

ODI parameter

    

ODI2

37.58 ± 23.50

41.48 ± 19.42

37.03 ± 23.98

0.073

ODI3

26.16 ± 23.93

27.53 ± 19.18

25.96 ± 24.53

0.521

ODI4T

20.44 ± 23.06

19.84 ± 17.99

20.53 ± 23.70

0.767

ODI4A*

24.65 ± 26.00

31.16 ± 24.23

23.73 ± 26.13

0.015

Heart Rate

73.32 ± 11.02

73.85 ± 12.49

73.24 ± 10.79

0.703

TST (min)**

309.0 ± 63.4

180.2 ± 53.3

327.1 ± 39.1

0.002

Latency (min)***

19.6 ± 21. 1

41.5 ± 40.2

16.6 ± 14.4

<0.001

Arousal count***

153.9 ± 99.09

103.2 ± 65.3

161.0 ± 101.0

<0.001

Arousal Index*

33.6 ± 20.7

39.3 ± 22.4

32.8 ± 20.3

0.011

  1. aNormal: AHI < 5; Mild: 5≦AHI < 15; Moderate: 15≦AHI < 30; Severe: AHI≧30.
  2. bANOVA test with *p < 0.05, **p < 0.01, and ***p < 0.001; Pearson Chi-square test with †p < 0.001.