Table 4. The Univariable and Multivariable Analysis of Prognostic Factors in Solitary-Type IMA Patients.

Prognostic Factors	DFS			OS
	Univariable	Multivariable Analysis		Univariable	Multivariable
	P (Adjusted)	HR (95% CI [Adjusted])	P (Adjusted)	P (Adjusted)	HR (95% CI [Adjusted])	P (Adjusted)
Clinicopathologic features
Sex (male)	0.182			0.052
Overall stage (I as ref.)	< 0.001		< 0.001	< 0.001		< 0.001
II	< 0.001	2.335 (1.088–5.011)	0.026	< 0.001	3.494 (1.354–9.017)	0.006
III	< 0.001	5.284 (2.518–11.089)	< 0.001	< 0.001	7.857 (3.364–18.323)	< 0.001
VPI (presence)	0.016			0.018
Tumor size	< 0.001			< 0.001
CT imaging features
Location (central)	0.112			0.050	1.921 (0.799–4.617)	0.190
Spiculation (absence as ref.)	< 0.001		0.068	0.006
Few (≤ 4)	1.000	0.953 (0.454–2.000)	1.000	0.990
Much (> 4)	< 0.001	1.855 (0.943–3.651)	0.082	0.016
Pleural retraction (presence)	0.026	1.622 (0.921–2.857)	0.112	0.256
Tumor density (pure-solid)	0.002			0.024
Air bronchogram (absence)	< 0.001	3.731 (1.596–8.721)	0.002	0.008	4.264 (1.618–11.239)	0.002
Lymphadenopathy (presence)	< 0.001			< 0.001
Emphysema (presence)	< 0.001	1.273 (1.124–4.370)	0.024	0.002	1.315 (1.016–1.701)	0.034
Pleural effusion (presence)	0.034			0.042
UIP pattern (presence)	0.002			0.002
Lesion in non-tumor lobe (presence)	0.032			0.012