Table 4.

Factors associated with elevated depression.

Variables	Unitivariable analysis			Multivariable analysis
	P	OR	95%CI	P	OR	95%CI
Gender (male)	0.450	0.71	0.29–1.74
Age
20–30	0.451	0.37	0.03–5.00
30–40	0.169	0.39	0.10–1.49
40–50	0.807	1.22	0.25–6.07
50–60	0.411	0.56	0.14–2.25
60–70
Marital status
Married	0.703	1.27	0.37–4.41
Single	0.547	0.55	0.08–3.87
Divorced
Occupation
State-owned units	0.068	0.36	0.12–1.08
Private units	0.107	0.41	0.14–1.21
Freelance work	0.397	0.60	0.18–1.95
Retired
Education level
Elementary	0.183	5.89	0.43–80.32
Middle school	0.002*	3.91	1.65–9.25	0.192	2.24	0.67–7.49
Bachelor or above
Socio-economic status
Very low	0.003*	7.89	1.99–31.28	0.411	2.29	0.32–16.56
Low	0.030*	3.48	1.13–10.77	0.021*	6.22	1.33–29.14
Middle	0.081	2.72	0.88–8.34
High
Smoking	0.369	0.533	0.14–2.10
Drinking	0.803	0.87	0.30–2.51
Frequency of going to the dental clinics
Regular check	0.259	3.96	0.36–43.29
Seldom	0.820	0.71	0.04–13.24
When necessary	0.233	3.77	0.43–33.38
Never
Voluntary service	0.308	0.66	0.29–1.46
Vaccination	0.420	1.52	0.55–4.19
TMD symptoms
No symptoms of TMD
Symptoms of TMD without pain	0.359	1.74	0.53–5.70
Symptoms of TMD with pain	<0.001*	15.01	4.48–50.25	0.012*	7.35	1.55–34.81
Tooth loss	0.042*	2.26	1.03–4.97	0.009*	4.48	1.45–13.80
Sleep disorder	0.005*	4.03	1.52–10.73	0.007*	5.13	1.55–16.98
Tinnitus	0.005*	3.35	1.44–7.79	0.205	2.16	0.66–7.06
Relatively close contacts	<0.001*	11.21	3.19–39.49	0.001*	12.94	2.98–56.15

^*, P < 0.05 was considered significant.