Table 1. Characteristics of original 1993 birth cohort and oral health subsample of cohort members at 18 years age, Pelotas, Rio Grande do Sul, Brazil, 2012.
| Original cohort | Subsample at 18 years of ages | ||||
| N | % (95%CI) | N | % (95%CI) | p-value * | |
| Gender | |||||
| Male | 2603 | 49.6 (48.3; 50.9) | 526 | 52.2 (49.8; 55.3) | <0.001 |
| Female | 2645 | 50.4 (49.1; 51.8) | 487 | 47.8 (44.6; 50.9) | |
| Mother's schooling (years) | |||||
| ≤4 | 1468 | 28.0 (26.8; 29.2) | 228 | 24.6 (21.8; 27.4) | |
| 5–8 | 2424 | 46.24 (44.9; 47.6) | 386 | 41.8 (38.5; 44.9) | <0.001 |
| 9–11 | 923 | 17.60 (16.6; 18.6) | 261 | 28.4 (25.5; 31.4) | |
| ≥12 | 427 | 8.1 (7.4; 8.9) | 48 | 5.3 (3.8; 6.8) | |
| Household income (based on minimum wage) | |||||
| 1st tertile | 2226 | 43.3 (41.9; 44.7) | 339 | 32.7(29.9; 35.7) | |
| 2nd tertile | 1445 | 28.1 (26.9; 29.4) | 335 | 33.2(30.2; 36.2) | <0.001 |
| 3rd tertile | 1466 | 28.5 (27.3; 29.8) | 336 | 34.0(31.0; 37.0) | |
*chi-square test.