Table 4.

Sensitivity analysis for factors of depression by using Cox regression.

Tracking interval	Oral cancer vs. non-oral cancer			Oral cancer vs. non-cancer
	Adjusted HR	95% CI	p	Adjusted HR	95% CI	p
Overall	1.112	0.834–1.482	0.424	2.224	1.641–3.013	< 0.001
< 1 year	1.407	0.897–1.678	0.306	3.392	2.243–6.665	< 0.001
≧ 1 year, < 3 years	1.295	0.855–1.592	0.398	2.604	1.725–4.076	< 0.001
≧ 3 years, < 5 years	1.112	0.831–1.466	0.433	1.498	1.127–2.791	0.001
≧ 5 years	1.098	0.792–1.403	0.501	1.364	1.035–2.005	0.013

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