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Table 3 Gas compression at different levels of forced expiration according to patient group

From: Thoracic gas compression during forced expiration in patients with emphysema, interstitial lung disease and obesity

 

Controls (N = 16) (L/s)

M, RD p-value

ILD (N = 15) (L/s)

M, RD p-value

Emphysema (N = 16) (L/s)

M, RD p-value

Obese (N = 15) (L/s)

M, RD p-value

PEF mouth

7.62 (1.95) (5.0 – 11.2)

0.013 (-0.1 – 0.5)

7.33 (2.41) (3.2 – 12.4)

- 0.007 (-0.02 – 0.2)

3.73 (1.82) (1.9 – 7.6)

0.11 (-0.25 – 0.46)

6.45 (1.01) (5.1 – 8.3)

0.03 (0 – 0.21)

NS

0.012

NS

NS

PEF thoracic

7.64 (1.96) (5.0 – 11.4)

7.33 (2.41) (3.2 – 12.4)

3.84 (1.85) (2.0 – 7.7)

6.48 (1.01) (5.1 – 8.3)

MEF75 mouth

6.40 (1.74) (4.4 – 9.9)

1.03 (-0.14 –3.55)

7.05 (2.44) (3.2 – 12.3)

0.073 (-0.85 – 2.15)

1.45 (1.13) (0.3 – 3.6)

1.26 (0.0 – 3.89)

5.6 (1.11) (4.0 – 8.3)

0.75 (0 – 1.84)

MEF75 thoracic

7.42 (1.86) (4.9 – 11.0)

0.002

7.1 (2.35) (3.2 – 12.2)

NS

2.72 (1.93) (0.6 – 7.4)

0.001

6.31 (1.09) (4.8 – 8.3)

0.001

MEF50 mouth

3.62 (1.57) (1.5 – 8.1)

1.16 (-1,13 –3.33)

4.01 (1.12) (2.1 – 5.8)

1.5 (-0.63 – 3.78)

0.63 (0.37) (0.2 – 1.3)

0.3 (-0.13 – 1.39)

3.06 (1.01) (1.5 – 4.6)

1.33 (0.21 – 2.92)

MEF50 thoracic

4.78 (1.53) (2.8 – 8.2)

0.002

5.31 (2.00) (1.8 – 9.6)

<0.001

0.93 (0.59) (0.2 – 2.2)

0.01

4.40 (1.01) (3.3 – 7.0)

< 0.001

MEF25 mouth

1.18 (0.66) (0.5 – 3.0)

0.21 (-1.37 – 1.12)

1.18 (0.38) (0.5 – 2.0)

0.33 (-0.68 – 3.54)

0.24 (0.12) (0.1 – 0.4)

0.03 (-0.8 – 0.16)

0.77 (0.31) (0.4 – 1.2)

0.27 (-0.38 – 0.84)

MEF25 thoracic

1.38 (0.90) (0.3 – 4.2)

NS

1.51 (1.01) (0.4 – 4.6)

NS

0.27 (0.08) (0.1 – 0.4)

NS

1.05 (0.43) (0.4 – 1.9)

0.006

  1. Compressed (mouth) and uncompressed (thoracic measurement) flow values (mean, SD and range) at different levels of forced expiration; at peak expiratory flow (PEF), maximal expiratory flow when 75% of forced vital capacity remains exhaled (MEF75), MEF 50 and MEF 25. Means (M) and ranges (RD) of the differences and the p-values of the paired t-test results between thoracic and mouth measurements in each group are presented.