Parameter

COPD cases (n=17)

Asthma cases (n=18)

Controls (n=16)

r

p Value

r

p Value

r

p Value

FVC (L)

0.505

0.039

0.094

0.711

0.453

0.078

FEV1 (L)

0.757

<0.0001

0.106

0.675

0.351

0.182

FEV1: forced expiratory volume in one second. FVC: forced vital capacity. MVAET:
maximal voluntary apnea expiratory time.
Table 3: Bivariate correlations with MVAET in cases and controls.