Table 2.
The distribution of developmental defects of the enamel (DDE) among the age cohorts
| Age | DDE | MIH | General. DDE | Total, N | |||
|---|---|---|---|---|---|---|---|
| No, N (%) | Yes, N (%) | No, N (%) | Yes, N (%) | No, N (%) | Yes, N (%) | ||
| Cohort | |||||||
| 11 | 185 (70.3%) | 78 (29.7%) | 218 (82.9%) | 45 (17.1%) | 262 (99.6%) | 1 (0.4%) | 263 |
| 15 | 163 (61.0%) | 104 (39.0%) | 237(88.8%) | 30 (11.2%) | 235 (88.0%) | 32 (12.0%) | 267 |
| 19 | 184 (69.2%) | 82 (30.8%) | 244 (91.7%) | 22 (8.3%) | 232 (87.2%) | 34 (12.8%) | 266 |
| Total | 532 (66.8%) | 264 (33.2%) | 699 (87.8%) | 97 (12.2%) | 729 (91.6%) | 67 (8.4%) | 796 |
| p = 0.05 | p = 0.01 | p < 0.001 | |||||
The table also shows the distribution of MIH and generalised DDE judged from the clinical registration and information in the dental records