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Table 3 Effect of time of assessment after surgical procedure on prevalence estimate

From: Prevalence of obstructive sleep apnoea in acute coronary syndrome patients: systematic review and meta-analysis

Time after procedure

No. studies

Random pooled prevalence (95% CI)

Significance tests of prevalence = 0

Heterogeneity

statistic

df

P

I^2*

Mild OSA AHI ≥ 5

PSG

Within 2 weeks

2

0.67 (0.61–0.72)

z = 24.01, p = 0.00

> 2 weeks

4

0.72 (0.67–0.76)

z = 28.72, p = 0.00

4.22

3

0.24

28.94%

Test for heterogeneity between timing sub-groups 1.51, df = 1, p = 0.22

Portable

Within 2 weeks

6

0.59 (0.53–0.65)

z = 19.80, p = 0.00

16.24

5

0.01

69.22%

> 2 weeks

3

0.72 (0.55–0.89)

z = 8.43, p = 0.00

Test for heterogeneity between timing sub-groups 2.01, df = 1, p = 0.16

Moderate OSA AHI ≥ 15

PSG

Within 2 weeks

4

0.51 (0.45–0.57)

z = 16.75, p = 0.00

4.37

3

0.22

31.28%

> 2 weeks

6

0.43 (0.39–0.48)

z = 19.98, p = 0.00

4.40

6

0.49

0.01%

Portable

Within 2 weeks

16

0.50 (0.44–0.56)

z = 16.84, p = 0.00

36.77

15

0.00

95.26%

> 2 weeks

3

0.49 (0.43–0.54)

z = 18.73, p = 0.00

Test for heterogeneity between timing sub-groups 0.20, df = 1, p = 0.65

Severe OSA AHI ≥ 30

PSG & Portable combined

Within 2 weeks

8

0.22 (0.15–0.29)

z = 6.47, p = 0.00

39.26

7

0.00

84.72%

> 2 weeks

2

0.24 (0.18–0.30)

z = 7.41, p = 0.00

Test for heterogeneity between timing sub-groups 0.16, df = 1, p = 0.69

  1. a I^2: the variation in ES attributable to heterogeneity; PSG Polysomnography, OSA Obstructive sleep apnoea, AHI Apnoea/hypoxia index