| | Variables | | N (%) |
| | Gender | Female | 281 (51, 6) | | Male | 264 (48, 4) |
| | Age | 6 years | 84 (15, 4) | | 7 years | 75 (13, 7) | | 8 years | 80 (14, 7) | | 9 years | 80 (14, 7) | | 10 years | 80 (14, 7) | | 11 years | 73 (13, 4) | | 12 years | 73 (13, 4) |
| | Mean age (DP) | 8.93 (1.99) | |
| | Monthly family income | No income | 2 (0, 5) | | Up to 1 salary (200 USD) | 53 (12, 4) | | From 1 to 2 salaries (200–400 USD) | 138 (32, 2) | | From 2 to 3 salaries (400–600 USD) | 132 (30, 8) | | From 3 to 4 salaries (600–800 USD) | 69 (16, 1) | | From 5 to 10 salaries (1.000–2.000 USD) | 23 (5, 4) | | 10 to 20 salaries (2.000–4.000 USD) | 9 (2, 1) | | More than 20 salaries (>4.000 USD) | 2 (0, 5) |
| | Parental education level (mean) | Less than 8 years | 158 (29, 0) | | Over 8 years | 387 (71, 0) |
| | DMFT | DMFT = 0 | 425 (78, 0) | | DMFT > 0 | 120 (22, 0) |
| | dmft | dmft = 0 | 317 (58, 2) | | dmft > 0 | 228 (41, 8) |
| | MIH | MIH = 0 | 467 (85, 7) | | MIH > 0 | 78 (14, 3) |
| | MIH | Public school | 56 (13.7) | | Private school | 22 (16.2) |
| | DMH | DMH = 0 | 532 (97, 6) | | DMH > 0 | 13 (2, 4) |
| | DF | DFs = 0 | 422 (77, 4) | | DF > 0 | 123 (22, 6) |
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