Table 2.

Survey logistic regression models^a examining the incidence rate of reported arthritis in the dental amalgam filling surfaces group as compared to the other dental filling surfaces group in the NHANES database.

Outcome	Variables	Odds ratio	95% confidence interval	P-value
Arthritis b	Dental amalgam filling surfaces group versus other dental filling surfaces group	7.68	2.53 to 23.2	.0003
	Dental amalgam filling surfaces group versus other dental filling surfaces group	4.89	1.55 to 15.5	.0069
	Race	0.89	0.74 to 1.07	.20
	Gender	0.87	0.33 to 2.26	.77
	Socioeconomic status	1.01	0.82 to 1.25	.90
	Country of birth	0.47	0.27 to 0.82	.0086
	Age	1.06	1.04 to 1.08	<.0001
	Education level	0.99	0.75 to 1.3	.95

Bold-Italicized results are statistically significant.

^aThe survey logistic model employed used stratum, cluster, and weight variables. The incidence rate of reported arthritis in the year of the NHANES survey was evaluated among those weighted-persons with ⩾1 amalgam filling surfaces (dental amalgam filling surfaces group) in comparison to those weighted-persons with ⩾1 other dental filling surfaces and 0 dental amalgam filling surfaces (other dental filling surfaces group).

^bThe incidence rate of reported arthritis was derived from NHANES survey data among those persons with reported arthritis in the year of the NHANES survey collection. Those persons with reported arthritis at any time prior to the year of the NHANES survey collection were eliminated from the analyses.