Incisor Molar Hypomineralization and Quality of Life: A Population-Based Study with Brazilian Schoolchildren

Table 1

Sample characterization regarding sociodemographic, economic, and clinical factors.

Variable	n (%)
Sex
Female	293 (63.3)
Male	170 (36.7)
Age
11	141 (30.5)
12	168 (36.3)
13	101 (21.8)
14	53 (11.4)
Family income in minimum wages (MW)^1
≤1 MW	350 (83.7)
>1 MW	68 (16.3)
Parents/caregivers’ schooling
≤8 years of study	276 (60.7)
>8 years of study	179 (39.3)
Family structure
Nonnuclear	229 (49.5)
Nuclear	234 (50.5)
Visited the dentist once in life
Yes	356 (76.9)
No	107 (23.1)
MIH
Present	50 (10.8)
Absent	413 (89.2)
MIH on incisors
Present	16 (3.5)
Absent	447 (96.5)
MIH on molars
Present	50 (10.8)
Absent	413 (89.2)
MIH severity
Mild	22 (44.0)
Severe	28 (56.0)
Dental caries experience
Yes	371 (80.1)
No	92 (19.9)
Malocclusion
Present	224 (48.4)
Absent	239 (51.6)
Dental fluorosis
Present	49 (10.6)
Absent	414 (89.4)
Hypoplasia^2
Present	5 (1.1)
Absent	458 (98.9)
Amelogenesis imperfecta^2
Present	1 (0.2)
Absent	462 (99.8)
Hypomineralization other than MIH
Present	21 (4.5)
Absent	442 (95.5)

¹Value of the Brazilian minimum wage in force at the time of the research was equivalent to Rs. 99,800 (US$ 264.00). ²Due to the very low N, the variable was not included in the regression analysis.