Table 3.

Factors of depression stratified by oral cancer subgroup by using Cox regression.

Subgroup	Oral cancer	Depression	Oral cancer vs. non-oral cancer			Oral cancer vs. non-cancer
	n	n	Adjusted HR	95% CI	p	Adjusted HR	95% CI	p
Total	3031	69	1.112	0.834–1.482	0.424	2.224	1.641–3.013	< 0.001
Lip	231	8	1.276	0.617–2.638	0.486	2.379	1.148–4.930	0.001
Tongue	1031	26	1.368	0.900–2.080	0.127	2.539	1.645–3.920	< 0.001
Major salivary glands	35	0	0.000	–	0.944	0.000	–	0.942
Gum	194	5	1.086	0.443–2.662	0.842	2.163	1.083–5.339	0.020
Floor of mouth	118	3	1.328	0.420–4.205	0.599	2.791	1.010–8.949	0.031
Cheek mucosa	686	13	1.291	0.722–2.312	0.380	1.872	1.036–3.380	0.029
Others	736	14	0.819	0.471–1.423	0.462	2.326	1.323–4.091	< 0.001

HR hazard ratio, CI confidence interval, Adjusted HR adjusted variables listed in Table 2.