Hypodontia according to side and uni- or bilateral occurrence_
| Tooth type | Right side | Left side | Bilateral agenesis | Unilateral agenesis | Total | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No. | % of sample | % of missing teeth | No. | % of sample | % of missing teeth | No. | % of sample | % of missing teeth | No. | % of sample | % of missing teeth | No. | % of sample | % of missing teeth | |
| 32/42 | 11 | 1.4 | 9.4 | 10 | 1.2 | 8.5 | 5 | 0.6 | 4.3 | 11 | 1.4 | 9.4 | 16 | 2.0 | 17.9 |
| 12/22 | 11 | 1.4 | 9.4 | 10 | 1.2 | 8.5 | 7 | 0.9 | 6.0 | 7 | 0.9 | 6.0 | 14 | 1.7 | 17.9 |
| 35/45 | 7 | 0.9 | 6.0 | 8 | 1.0 | 6.8 | 4 | 0.5 | 3.4 | 7 | 0.9 | 6.0 | 11 | 1.4 | 12.8 |
| 15/25 | 9 | 1.1 | 7.7 | 7 | 0.9 | 6.0 | 6 | 0.7 | 5.1 | 4 | 0.5 | 3.4 | 10 | 1.2 | 13.7 |
| 13/23 | 7 | 0.9 | 6.0 | 5 | 0.6 | 4.3 | 2 | 0.2 | 1.7 | 8 | 1.0 | 6.8 | 10 | 1.2 | 10.3 |
| 31/41 | 8 | 1.0 | 6.8 | 8 | 1.0 | 6.8 | 7 | 0.9 | 6.0 | 2 | 0.2 | 1.7 | 9 | 1.1 | 13.7 |
| 14/24 | 3 | 0.4 | 2.6 | 3 | 0.4 | 2.6 | 2 | 0.2 | 1.7 | 2 | 0.2 | 1.7 | 4 | 0.5 | 5.1 |
| 33/43 | 2 | 0.2 | 1.7 | 1 | 0.1 | 0.9 | 0 | 0.0 | 0.0 | 3 | 0.4 | 2.6 | 3 | 0.4 | 2.6 |
| 16/26 | 1 | 0.1 | 0.9 | 2 | 0.2 | 1.7 | 1 | 0.1 | 0.9 | 1 | 0.1 | 0.9 | 2 | 0.2 | 2.6 |
| 17/27 | 1 | 0.1 | 0.9 | 2 | 0.2 | 1.7 | 1 | 0.1 | 0.9 | 1 | 0.1 | 0.9 | 2 | 0.2 | 2.6 |
| 11/21 | 1 | 0.1 | 0.9 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0.1 | 0.9 | 1 | 0.1 | 0.9 |
Distribution of recorded cases and prevalence of hypodontia_
| Ethnicity | Hypodontia | Total sample | Prevalence (%) | ||
|---|---|---|---|---|---|
| Male | Female | Combined | |||
| Malay | 6 | 24 | 30 | 380 | 7.9 |
| Chinese | 8 | 20 | 28 | 338 | 8.3 |
| Indian | 4 | 2 | 6 | 95 | 6.3 |
| Overall | 18 | 46 | 64 | 813 | 7.9 |
Number of missing teeth and frequency distribution_
| No. of missing teeth | Males, N (%) | Females, N (%) | Total, N (%) |
|---|---|---|---|
| 1 | 9 (50) | 23 (50) | 32 (50) |
| 2 | 7 (39.9) | 14 (30.4) | 21 (32.8) |
| 3 | 0 (0) | 4 (8.7) | 4 (6.3) |
| 4 | 1(5.6) | 3(6.5) | 4 (6.3) |
| 5 | 1 (5.6) | 2 (4.4) | 3 (4.7) |
| Total | 18 (100) | 46 (100) | 64 (100) |
Missing teeth according to ethnicity_
| Tooth type | Ethnicity | Total | ||
|---|---|---|---|---|
| Malay | Chinese | Indian | ||
| 32/42 | 10 | 10 | 1 | 21 |
| 12/22 | 12 | 7 | 2 | 21 |
| 31/41 | 13 | 3 | 0 | 16 |
| 15/25 | 6 | 6 | 4 | 16 |
| 35/45 | 5 | 5 | 5 | 15 |
| 13/23 | 7 | 4 | 1 | 12 |
| 14/24 | 2 | 2 | 2 | 6 |
| 33/43 | 1 | 2 | 0 | 3 |
| 16/26 | 0 | 1 | 2 | 3 |
| 17/27 | 0 | 3 | 0 | 3 |
| 11/21 | 1 | 0 | 0 | 1 |
| Total | 57 | 43 | 17 | 117 |