Table 4.

Multivariate logistic regression analysis of factors with MT > 0 among 35–44 years adults in Guangdong Province stratified by the year of surveys

Variables	1995			2005		2015
	MT > 0 (%)		OR (95%CI)	MT > 0 (%)	OR (95%CI)	MT > 0 (%)	OR (95%CI)
Age
35–39 years old†		39.8	–	34.4	–	29.9	–
40–44 years old	41.8		0.80 (0.50–1.29)	52.3	1.81 (1.32–2.48)	37.1	1.52 (0.90–2.56)
Sex
Male†	36.5		–	38.7	–	26.6	–
Female	45.2		1.14 (0.71–1.83)	47.1	1.13 (0.82–1.56)	42.3	2.04 (1.21–3.46)
Residence
Urban†	37.0		–	42.1	–	26.4	–
Rural	44.5		1.09 (0.67–1.80)	43.7	0.86 (0.62–1.20)	41.0	2.63 (1.43–4.84)
Education level
Low educational attainment†	48.2		–	47.5	–	35.4	–
High educational attainment	31.7		0.43 (0.26–0.73)	35.9	0.67 (0.48–0.94)	31.5	1.62 (0.88–2.98)
Caries
No†	9.3		–	28.8	–	24.8	–
Yes	55.7		13.76 (7.13–26.56)	53.5	2.63 (1.89–3.67)	39.1	2.07 (1.18–3.63)
Periodontal pocket
No†	37.5		–	40.0	–	30.1	–
Yes	49.5		1.97 (1.16–3.34)	50.8	1.39 (0.96–1.98)	38.2	1.77 (1.04–3.02)

OR odds ratio, CI confidence interval

^†Reference category