Table 2. Results of univariate and multivariate analyses of survival after PSM.

Characteristics	Univariable			Multivariable
	HR (95% CI)	P value		HR (95% CI)	P value
Gender
Female	Reference
Male	0.51 (0.17–1.52)	0.226
Age
≤60 years	Reference			Reference
>60 years	4.33 (1.21–15.53)	0.024*		9.12 (1.96–42.53)	0.005*
Smoke
No	Reference
Yes	1.06 (0.37–3.06)	0.914
T
T1	Reference
T2	1.18 (0.36–3.94)	0.782
T3	2.18 (0.46–10.28)	0.325
N
N0	Reference			Reference
N1	3.98 (1.23–12.94)	0.022*		2.73 (0.82–9.04)	0.101
N2	0 (0–Inf)	0.998		0 (0–Inf)	0.998
N3	1.32 (0.17–10.46)	0.791		0.43 (0.05–3.80)	0.444
Stage
I	Reference
II	2.09 (0.45–9.69)	0.345
III	0.80 (0.22–2.95)	0.734
Lymphovascular invasion
No	Reference
Yes	1.32 (0.30–5.91)	0.716
Perineural invasion
No	Reference
Yes	1.12 (0.15–8.57)	0.914
Pleural involvement
No	Reference
Yes	1.19 (0.41–3.44)	0.743
Laterality
Left	Reference
Right	1.15 (0.40–3.30)	0.801
Location
Lower	Reference			Reference
Middle	4.10 (1.02–16.45)	0.046*		13.60 (2.49–74.13)	0.003*
Upper	1.62 (0.46–5.74)	0.455		1.62 (0.45–5.82)	0.462
Operation
Sublobar resection	Reference			Reference
Lobectomy	29,347,409.79 (0–Inf)	0.998
Pneumonectomy	384,226,247.17 (0–Inf)	0.998

*, P value is less than 0.05. PSM, propensity score matching; IMA, pulmonary invasive mucinous adenocarcinoma group; NMA, pulmonary non-invasive mucinous adenocarcinoma group; HR, hazard ratio; CI, confidence interval.