. Author manuscript; available in PMC: 2015 Jan 8.

Published in final edited form as: Int J Radiat Oncol Biol Phys. 2008 Dec 10;74(3):781–789. doi: 10.1016/j.ijrobp.2008.08.053

Table 2.

Correlation between the average increases in lung density and reductions in PFTs for the overall group

		No. of tests	r	p-value
Overall – all data considered 3 to 24 months post-RT	CT vs. DLCO	203	0.26	<0.001
Overall – all data considered 3 to 24 months post-RT	CT vs. FEV1	203	0.34	<0.001
6-month follow-up interval	CT vs. DLCO	72	0.29	0.015
6-month follow-up interval	CT vs. FEV1	72	0.35	0.003
Averaged data over all follow-up intervals	CT vs. DLCO	111	0.23	0.016
Averaged data over all follow-up intervals	CT vs. FEV1	111	0.36	<0.001
At the time of maximum PFT decline	CT vs. DLCO	111	0.20	0.034
At the time of maximum PFT decline	CT vs. FEV1	111	0.30	0.001
At the time of maximum density increase	CT vs. DLCO	111	0.17	0.070
At the time of maximum density increase	CT vs. FEV1	111	0.37	<0.001

Abbreviations: DLCO = diffusion capacity for carbon monoxide; FEV1 = forced expiratory volume in 1 second; PFT = pulmonary function tests