Table 1.

Occurrence of dental erosion according to gender, age, income, and self-reported ethnicity.

Dental erosion							P value*
	Presence		Absence		Total
	n	%	n	%	n	%
Gender
Male	61	22.3	212	77.7	273	100	0.492
Female	81	20.1	321	79.9	402	100
Age
15	37	21.9	132	78.1	169	100	0.654
16	50	22.4	173	77.6	223	100
17	39	21.7	141	78.3	180	100
18	12	14.6	70	85.4	82	100
19	4	19.0	17	81	21	100
Family income
<2 MW	78	20.9	296	79.1	374	100	0.897
≥2 MW	64	21.3	237	78.7	301	100
Ethnicity
White	31	21.4	114	78.6	145	100	0.909
Nonwhite	111	20.9	419	79	530	100
Total	142	21.0	533	79.0	675	100

*Chi-square test, MW (minimum wage of R$ 622.00 in the year 2012.