Table 3 –

Bruxism and painful TMD: Results of Multiple Logistic Regression with Awake Bruxism and Sleep Bruxism as Independent Predictors (Model 1), with Interaction between Awake Bruxism and Sleep Bruxism (Model 2), and Adjusted for Sociodemographic, Socioeconomic, and Psychosocial Characteristics (Model 3) Awake bruxism#sleep bruxism indicates the interaction term

	Odds ratio / RERI	95% CI
Model 1
Awake bruxism	5.1	3.3 – 7.8
Sleep bruxism	4.2	2.8 – 6.2
Model 2
Awake bruxism	6.7	3.5 – 12.8
Sleep bruxism	4.9	3.0 – 7.9
Awake bruxism#sleep bruxism:
Multiplicative Interaction	0.60	0.25 – 1.4
Additive Interaction (RERI)	9.5	1.3 – 19.7
Model 3
Awake bruxism	6.7	3.4 – 12.9
Sleep bruxism	5.1	3.1 – 8.3
Awake bruxism#sleep bruxism:
Multiplicative Interaction	0.57	0.24 – 1.4
Additive Interaction (RERI)	8.6	1.0 – 19.7
Age
First quartile (18 – 25 yrs)*	–	–
Second quartile (26 – 35 yrs)	0.80	0.46 – 1.4
Third quartile (36 – 48 yrs)	0.64	0.37 – 1.1
Fourth quartile (49 – 67 yrs)	0.63	0.37 – 1.1
Gender [female]	2.1	1.3 – 3.3

^*reference category

OR – odds ratio; RERI – relative excess risk due to interaction, CI – confidence interval