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Table 3 Polysomnography characteristics of the CAD patients according to SA severity

From: The association of sleep disordered breathing with left ventricular remodeling in CAD patients: a cross-sectional study

  

SA severity group

Variable

non-SA

AHI < 5

n = 472

Mild

AHI: 5–14.9

n = 192

Moderate

AHI: 15–29.9

n = 59

Severe

AHI: ≥30

n = 49

p for trendc

  

1

2

3

 

AHI, n/h

1.7 ± 1.5a

9.0 ± 2.9

21.7 ± 4.5

44.3 ± 10.8

<0.001

ODI, %

2.6 ± 7.7a

8.1 ± 12.423

14.0 ± 17.413

35.1 ± 25.112

<0.001

Average SaO2, %

94.5 ± 1.7a

93.9 ± 1.83

93.4 ± 2.83

91.9 ± 4.912

0.001

DeSaO2 max, %

6.7 ± 8.3a

12.0 ± 8.03.

15.2 ± 10.53

24.6 ± 17.512

<0.001

ESS score

6.0 ± 3.5b

6.7 ± 3.5

6.0 ± 3.2

7.6 ± 3.8

0.062

ESS > 10, n (%)

74 (15.7)

34 (17.7)

11 (18.6)

12 (24.5)

0.556

  1. Data are presented as mean ± SD or number of patients (%)
  2. SA sleep apnea, AHI apnea-hypopnea index, events per hour, ODI oxygen desaturation index, SaO 2 saturation of nocturnal arterial oxygen, DeSaO 2 max maximal oxygen desaturation, ESS Epworth sleepiness scale
  3. ap < 0.01 between non-SA and every SA groups
  4. b p < 0.05 between non-SA and Sever SA (ANOVA for all four groups, post hoc with Bonferroni correction)
  5. cANOVA or χ2 test for SA severity groups, non-SA group was excluded from this analysis
  6. 123the number in superscript indicates the SA severity groups, with significant differences p < 0.05 (ANOVA for three SA severity groups, post hoc with Bonferroni correction)