Table V.

Multivariate logistic regression model analysis of participants who reported using secondary oral products.

Variables	Model 1	Model 2	Model 3	Model 4
Income
Q1	1	1	1	1
Q2	1.548 (1.346–1.78)	1.523 (1.324–1.751)	1.505 (1.295, 1.75)	1.266 (1.092, 1.469)
Q3	2.160 (1.868–2.498)	2.121 (1.834–2.453)	2.116 (1.815, 2.468)	1.599 (1.371, 1.865)
Q4	2.899 (2.498–3.365)	2.825 (2.435–3.277)	2.730 (2.321, 3.212)	1.835 (1.559, 2.161)
P for trend	<.0001	<.0001	<.0001	<.0001
Education
Elementary school	1	1	1	1
Middle school	2.647 (2.218–3.159)	2.543 (2.128–3.038)	2.483 (2.057–2.997)	2.231 (1.849–2.692)
High school	4.448 (3.782–5.232)	4.314 (3.671–5.069)	4.279 (3.595–5.094)	3.669 (3.085–4.364)
University	7.487 (6.284–8.920)	7.344 (6.164–8.748)	7.196 (5.948–8.705)	5.736 (4.734–6.951)
P for trend	<.0001	<.0001	<.0001	<.0001

Data are presented as the adjusted odds ratio (95% confidence interval). Model 1, age, gender, and body mass index adjusted; Model 2, model 1 + smoking, drinking and exercise adjusted; Model 3, model 2 + energy intake, fat intake and periodontal treatment needs (CPI≥3) adjusted; Model 4, model 3 + education or income adjusted.