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Comparison of FEV1, IC, DLCO, and KCO in COPD patients who exhibit tidal expiratory flow limitation (EFL) in the supine position (FL; n = 14) versus those who do not (NFL; n = 13). Both DLCO and KCO are significantly lower in FL patients (*P < 0.05), suggesting that emphysematous patients are more prone to develop recumbent EFL.
