Table 2.

The diameter and thickness of the muscular pulmonary artery wall.

Factors	Normal (n = 5)	IPF (n = 24)	IPPFE (n = 18)	P value*
External diameter, μm	389 ± 26.6	342 ± 53.8	351 ± 71.0	0.632
Luminal diameter, %	59.0 ±± 2.01	41.0 ± 11.9	37.3 ± 7.80	0.261
Intimal thickness, %	6.84 ± 2.07	19.4 ± 8.95	16.9 ± 6.65	0.326
Medial thickness, %	15.0 ± 1.42	19.8 ± 4.46	19.5 ± 3.25	0.859
Adventitial thickness, %	19.0 ± 1.15	19.6 ± 4.07	26.0 ± 7.27	0.001

IPF, idiopathic pulmonary fibrosis; IPPFE, idiopathic pleuroparenchymal fibroelastosis.

*p values were calculated for the comparison of IPF and IPPFE patients. (Student’s t-test).