Table 3.

IPW-Weighted Multivariate Cox Survival Model

Variable	HR	95% CI	p-value
Chemotherapy Sequence
No Chemotherapy	—	—
Adjuvant	0.44	0.33, 0.58	< 0.001
Neoadjuvant	0.38	0.23, 0.62	< 0.001
Age	1.01	1.00, 1.02	0.11
Sex
Male	—	—
Female	1.31	0.90, 1.91	0.16
Charlson-Deyo Score	0.94	0.73, 1.21	0.63
Tumor Size (mm)	1.00	1.00, 1.01	0.19
Regional Lymphadenectomy
No	—	—
Yes	0.61	0.41, 0.92	0.020
Regional Nodes Examined	1.02	1.00, 1.05	0.084
Regional Nodes Positive	1.17	1.11, 1.23	< 0.001
Surgical Margins
R0	—	—
R1	2.98	2.06, 4.30	< 0.001
R2	3.91	2.35, 6.49	< 0.001

CI = Confidence Interval, HR = Hazard Ratio