Table 2. Cox Proportional Hazards Model for Overall Survival Duration and PHQ-9 Depression (Categorical).

	Full model				Reduced model
Effect	HR	95% LB	95% UB	p value	HR	95% LB	95% UB	p value
Age	1.0	0.94	1.07	0.9
Female	0.8	0.14	4.14	0.8
Chemotherapy (referent: none/neoadjuvant)
Concurrent only	1.5	0.34	6.29	0.6
Neoadjuvant and concurrent	1.4	0.27	6.99	0.7
Excessive alcohol use	3.5	0.36	34.67	0.3
Smoking status (referent: never)
Former	1.4	0.36	5.56	0.6
Recent	4.3	0.37	49.75	0.2
Current	3.1	0.73	13.18	0.1
Tumor size (referent: not T4/N3/N2c)
Any N3/N2c	2.4	0.52	10.65	0.3
Any T4	1.4	0.31	6.30	0.7
Total comorbidities	1.3	0.78	2.10	0.3	1.4	0.98	2.02	0.062
PHQ-9 Depression (Categorical)	3.5	1.01	12.30	0.049	3.6	1.21	10.82	0.022

HR, hazard ratio; UB, upper bound; LB, lower bound. Boldface indicates statistical significance.