Table 3. Selected baseline oral health indices of participants by sex and age.
| Age at baseline | Total | |||||||
| 20–29 | 30–39 | 40–49 | 50–59 | 60–69 | 70–79 | ≥80 | ||
| Men | ||||||||
| Brushing ≥3 times/day (%) | 51.2 | 56.9 | 56.3 | 55.7 | 55.0 | 45.4 | 36.6 | 54.6 |
| Filled teeth (mean number ± SD)* | 7.9 ± 8.2 | 10.1 ± 6.4 | 10.5 ± 6.3 | 8.4 ± 6.0 | 5.2 ± 5.4 | 3.8 ± 5.1 | 2.8 ± 4.7 | 8.4 ± 6.5 |
| Tooth loss (mean number ± SD) | 1.0 ± 4.4 | 0.7 ± 1.9 | 1.2 ± 2.2 | 2.4 ± 3.7 | 5.3 ± 7.0 | 13.0 ± 10.0 | 18.6 ± 9.6 | 3.4 ± 6.4 |
| Number of present teeth ≥20 (%) | 97.6 | 99.6 | 99.3 | 95.5 | 80.7 | 44.4 | 22.6 | 89.3 |
| Use of bridges (%)* | 0.0 | 10.6 | 22.1 | 28.2 | 23.1 | 19.8 | 17.6 | 22.2 |
| Use of partial dentures (%) | 2.4 | 4.6 | 11.8 | 20.8 | 36.8 | 55.6 | 50.3 | 21.4 |
| Use of full dentures (%) | 0.0 | 0.0 | 0.0 | 0.9 | 7.0 | 30.2 | 53.6 | 5.1 |
| CPI score ≥3 (%)† | 7.7 | 5.5 | 7.8 | 12.9 | 19.7 | 15.8 | 10.0 | 10.9 |
| CPI score =3 (%) | 5.1 | 4.7 | 6.5 | 9.8 | 15.1 | 11.8 | 7.9 | 8.6 |
| CPI score =4 (%) | 2.6 | 0.8 | 1.3 | 3.1 | 4.6 | 4.0 | 2.0 | 2.3 |
| No index teeth for CPI measurement (%) | 0.0 | 0.0 | 0.0 | 0.4 | 4.7 | 23.8 | 47.5 | 3.3 |
| History of periodontal diseases with pockets (≥4 mm) (%)* | 0.0 | 10.0 | 13.4 | 24.1 | 39.2 | 51.1 | 42.5 | 23.0 |
| GOHAI score (mean ± SD)‡ | 57.8 ± 3.7 | 56.0 ± 5.3 | 55.5 ± 5.4 | 54.5 ± 6.1 | 53.3 ± 6.9 | 51.5 ± 7.7 | 50.5 ± 8.3 | 54.5 ± 6.3 |
| (Number of participants with sufficient data) | (19) | (1122) | (3158) | (2675) | (1265) | (772) | (241) | (9252) |
| Women | ||||||||
| Brushing ≥3 times/day (%) | 83.3 | 73.8 | 72.8 | 78.9 | 60.3 | 59.3 | 47.9 | 71.2 |
| Filled teeth (mean number ± SD)* | 8.3 ± 5.5 | 11.5 ± 6.3 | 12.1 ± 5.9 | 10.8 ± 5.5 | 7.8 ± 5.1 | 4.7 ± 5.3 | 3.6 ± 5.8 | 10.0 ± 6.3 |
| Tooth loss (mean number ± SD) | 1.0 ± 1.7 | 0.9 ± 1.6 | 1.4 ± 2.1 | 2.0 ± 2.5 | 5.4 ± 6.6 | 13.1 ± 10.0 | 19.3 ± 9.6 | 3.9 ± 6.8 |
| Number of present teeth ≥20 (%) | 100.0 | 99.5 | 99.5 | 97.4 | 81.2 | 47.2 | 21.5 | 88.3 |
| Use of bridges (%)* | 18.2 | 15.3 | 21.7 | 35.8 | 38.5 | 32.8 | 22.4 | 27.5 |
| Use of partial dentures (%) | 5.6 | 7.7 | 11.4 | 21.5 | 43.6 | 58.2 | 43.0 | 22.9 |
| Use of full dentures (%) | 0.0 | 0.0 | 0.0 | 0.0 | 6.0 | 31.1 | 60.8 | 6.6 |
| CPI score ≥3 (%)† | 5.6 | 5.5 | 7.0 | 11.2 | 15.1 | 16.9 | 1.9 | 9.3 |
| CPI score =3 (%) | 5.6 | 4.0 | 6.3 | 8.1 | 13.0 | 13.9 | 1.9 | 7.6 |
| CPI score =4 (%) | 0.0 | 1.5 | 0.7 | 3.2 | 2.2 | 3.1 | 0.0 | 1.8 |
| No index teeth for CPI measurement (%) | 0.0 | 0.0 | 0.0 | 0.0 | 2.9 | 20.8 | 49.1 | 3.7 |
| History of periodontal diseases with pockets (≥4 mm) (%)* | 0.0 | 6.7 | 10.9 | 17.0 | 30.4 | 32.6 | 36.8 | 16.7 |
| GOHAI score (mean ± SD)‡ | 56.0 ± 4.0 | 56.2 ± 4.7 | 55.8 ± 5.5 | 55.0 ± 5.3 | 54.1 ± 5.3 | 52.3 ± 7.7 | 52.7 ± 6.3 | 55.0 ± 5.7 |
| (Number of participants with sufficient data) | (8) | (111) | (333) | (243) | (82) | (95) | (38) | (910) |
*Surveyed in 31 of the 46 prefectural dental associations.
†CPI: Community Periodontal Index.
‡GOHAI: General Oral Health Assessment Index. Index was surveyed in 20 of the 46 prefectural dental associations.