Table 4.

Relative ratio of BMS from 2004 to 2013 by multivariate Poisson regression for age.

	RR	95% C.I.		p value
		Lower	Upper
Year (per 1 year)	0.97	0.97	0.97	<0.001
age (ref: 40–49 years)
0–19 years	0.73	0.71	0.74	<0.001
20–29 years	0.53	0.52	0.55	<0.001
30–39 years	0.69	0.67	0.70	<0.001
50–59 years	1.55	1.52	1.58	<0.001
60–69 years	2.06	2.02	2.11	<0.001
≧70 years	2.58	2.53	2.63	<0.001

RR: Relative ratio; BMS: burning mouth syndrome.