Table 3.

Multinomial Logistic Regression: Independent Effects of Amount Smoked (cigarettes per day, CPD) Among Current Smokers on “weekly,” “Monthly,” and “Rarely” Reported Bruxism Compared With Never Bruxism as the Reference Category. Adjusted by Age and Gender

n= 2,604 current smokers	OR	95% CI	p Value
Weekly
Sex (female)	1.20	0.87–1.65	.26
Age	0.98	0.96–1.00	.06
CPD
1–9	1.00
10–19	1.09	0.72–1.65	.68
20–24	1.61	1.02–2.54	.041
>24	1.97	1.16–3.37	.013
Monthly
Sex (female)	0.90	0.61–1.32	.58
Age	0.97	0.94–0.99	.011
CPD
1–9	1.00
10–19	0.98	0.61–1.58	.95
20–24	1.71	1.01–2.90	.046
>24	1.79	0.98–3.25	.057
Rarely
Sex (female)	0.93	0.76–1.14	.49
Age	1.00	0.99–1.02	.56
CPD
1–9	1.00
10–19	0.97	0.76–1.23	.79
20–24	1.01	0.76–1.35	.95
>24	1.29	0.92–1.80	.14
Never	1.00	reference category

Note. Trend test for CPD categories was significant for weekly (p = .004) and monthly (p = .011) bruxism. OR = odds ratio.