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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.