Table 3.

Correlation between the average increases in lung density and reductions in PFTs for the subgroups.

	Factors	Subgroups	No. of tests	r	p-value
CT vs. DLCO	Smoking	smoker	177	0.30	<0.001
		non-smoker	26	−0.26	0.201
	Tumor type	lung	172	0.31	<0.001
		non-lung	31	−0.11	0.556
	Pulmonary symptom	no symptom	162	0.24	0.002
		with symptom	41	0.37	0.018
	Location of tumor	central	105	0.28	0.004
		peripheral	67	0.37	0.002
	Surgery	surgery	91	0.17	0.100
		no surgery	112	0.32	0.001
	Chemotherapy	chemotherapy	101	0.34	<0.001
		no chemotherapy	102	0.17	0.085
	Pre-RT DLCO	< 60%	66	0.25	0.042
		≥ 60%	137	0.24	0.004
CT vs. FEV1	Smoking	smoker	177	0.36	<0.001
		non-smoker	26	0.18	0.378
	Tumor type	lung	172	0.34	<0.001
		non-lung	31	0.29	0.110
	Pulmonary symptom	no symptom	162	0.35	<0.001
		with symptom	41	0.21	0.199
	Location of tumor	central	105	0.32	0.001
		peripheral	67	0.36	0.003
	Surgery	surgery	91	0.43	<0.001
		no surgery	112	0.29	0.002
	Chemotherapy	chemotherapy	101	0.39	<0.001
		no chemotherapy	102	0.29	0.004
	Pre-RT FEV1	< 2 L	105	0.26	0.008
		≥ 2 L	98	0.41	< 0.001

Abbreviations as in Table 1 and 2.