Fig. 6From: Multi-channel lung sounds intelligent diagnosis of chronic obstructive pulmonary diseaseThe box plots of IMFs and features under two classification. A The box plots of IMFs for mild COPD and moderate + severe COPD classification. B The box plots of features for mild COPD and moderate + severe COPD classification. C The box plots of IMFs for moderate COPD and severe COPD classification. D The box plots of features for moderate COPD and severe COPD classificationBack to article page