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Table 3 Sleep physiological variables

From: Obstructive sleep apnea and pulmonary function in patients with severe obesity before and after bariatric surgery: a randomized clinical trial

Variables

Control (n = 36)

Pre surgery (n = 16)

After surgery (n = 16)

p

    

(after vs. pre)

% SE

73.43 ± 9.16

74.27 ± 15.35

77.42 ± 23.73

ns

% 1NREM

10.80 ± 12.14

11.37 ± 10.78

14.34 ± 9.17

ns

% 2NREM

49.92 ± 18.71

57.52 ± 20.37

43.88 ± 5.80

ns

% 3NREM

15.68 ± 7.32

13.59 ± 10.62

17.54 ± 5.70

0.000*

% REM

23.60 ± 13.27

17.52 ± 11.91

24.24 ± 8.26

0.049*

Mean SaO2

92.66 (78 to 97)

93.30 (87 to 97)

94.3 (86.6 to 98)

ns

Nadir SaO2

79.90 (50 to 94)

83.25 (70 to 94)

85 (70 to 95)

ns

Wake SaO2

97 (94 to 98)

96.38 (95 to 99)

97 (94 to 99)

ns

Mean AHI

15.34 ± 9.14

15.65 ± 15.51

6.26 ± 7.57

0.008*

ESS

9.18 ± 5.34

6.92 ± 6.54

3.00 ± 3.56

ns

BQ

1.45 ± 0.50

1.75 ± 0.45

1.08 ± 0.28

0.001*

AHI (<5)

10

2

9

 

AHI ( 5 < 15)

14

7

6

 

AHI (15 < 30 )

5

4

1

 

AHI (≥30)

7

3

0

 
  1. AHI, Apnea/hypopnea index; BQ, Berlin Questionnaire; ESS, Epworth Sleepiness Scale; NREM, No Rapid-eye-movement sleep; REM, Rapid-eye-movement sleep; SaO2, Arterial oxygen saturation; SE, Sleep Efficiency. * p derived by paired Student’s t test.