Table 2 Age, DMF-T and QHI of the subjects in the three groups: congruence "no periodontitis", congruence "periodontitis", and "no congruence"
| Group | Age [years] (mean ± sd) | DMF-T (mean ± sd) | QHI (mean ± sd) |
| congruence "no periodontitis" (n = 17) | 24 ± 6 | 9.1 ± 4.3 | 1.4 ± 0.5 |
| congruence "periodontitis" (n = 42) | 42 ± 8.5 | 16.1 ± 5.1 | 2.7 ± 1.4 |
| "no congruence" (n = 53) | 28 ± 8 | 9.9 ± 4.9 | 2.3 ± 0.9 |
