Table 1.
Summary of Sample Data (n = 252 patients).
| Anterior-Group ** | Posterior-Group ** | Control-Group | |
|---|---|---|---|
| % (n) | % (n) | % (n) | |
| Gender | |||
| Male ♂ | 48.8 (41) | 45.2 (38) | 50.0 (42) |
| Female ♀ | 51.2 (43) | 54.8 (46) | 50.0 (42) |
| Social status * | |||
| Low | 17.9 (15) | 14.3 (12) | 15.5 (13) |
| Medium | 55.9 (47) | 58.3 (49) | 53.6 (45) |
| High | 26.2 (22) | 27.4 (23) | 31.0 (26) |
| Ethnicity | |||
| Caucasian | 83.3 (70) | 85.7 (72) | 84.5 (71) |
| Non-Caucasian | 16.7 (14) | 14.3 (12) | 15.5 (13) |
| Age | |||
| Mean | 8.6 years | 7.8 years | 8.5 years |
| 7 years | 20.2 (17) | 46.4 (39) | 25.0 (21) |
| 8 years | 27.4 (23) | 32.1 (27) | 25.0 (21) |
| 9 years | 27.4 (23) | 11.9 (10) | 25.0 (21) |
| 10 years | 25.0 (21) | 9.5 (8) | 25.0 (21) |
* Social status was determined according to the classification by Winkler & Stolzenberg [14]. ** Anterior-Group was defined as any affected hypomineralized incisor or canine, which might have also included a asymptomatic MIH molar. Posterior-Group was defined as any molar, which was affected by MIH. Control-Group patients had no MIH teeth at all.