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. 2011 Sep 12;1(2):e000184. doi: 10.1136/bmjopen-2011-000184

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© 2011, Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.

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Relationships between during inspiratory nadir values of R5 and X5 (A) and expiratory peak values of R5 and X5 (B) (▿, healthy; ●, chronic obstructive pulmonary disease). Significant correlations were obtained ((A), r=−0.70; p<0.0001; (B), r=−0.67; p<0.0001). Both relationships are also shown according to chronic obstructive pulmonary disease severity (■, Stage I; □, Stage II; ▲, Stage III; ▵, Stage IV) and healthy subjects (▿). Data are expressed as mean±SD.