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. 2013 Sep;3(3):665–674. doi: 10.1086/674339

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© 2013 by the Pulmonary Vascular Research Institute. All rights reserved.

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Interaction effects of lobar origin, arterial size, and pulmonary hypertension (PH) group on percentage wall thickness (%WT). The %WT for medium and large pulmonary arteries are less in the lower lobes compared with the upper lobes; however, there is no difference in the small pulmonary arteries across lobar origin (A). The %WT for the no PH group is less in the lower lobes compared with the upper lobes; however, there is no difference for mild and moderate-to-severe PH groups across lobar origin (B). There are no interaction effects between pulmonary arterial size and pulmonary arterial pressure group (C). P values are for comparisons between lower and upper lobe. *, †.

Inline graphic — Interaction effects of lobar origin, arterial size, and pulmonary hypertension (PH) group on percentage wall thickness (%WT). The %WT for medium and large pulmonary arteries are less in the lower lobes compared with the upper lobes; however, there is no difference in the small pulmonary arteries across lobar origin (A). The %WT for the no PH group is less in the lower lobes compared with the upper lobes; however, there is no difference for mild and moderate-to-severe PH groups across lobar origin (B). There are no interaction effects between pulmonary arterial size and pulmonary arterial pressure group (C). P values are for comparisons between lower and upper lobe. *, †.