Table 1.
Baseline Characteristics of Subjects (N = 416) and Distribution of Third Molars (N = 804)
| Characteristics | % (n) |
|---|---|
| Age, y | |
| Mean ± SD | 45.8 ± 7.4 |
| Range | 28.1-76.2 |
| Smoking status | |
| Nonsmokers | 67.8 (282) |
| Smokers | 32.2 (134) |
| Educational status | |
| High school or less | 22.1 (92) |
| Some college | 37.5 (156) |
| College graduate | 40.4 (168) |
| Third Molar Status | |
| Absent | |
| Mandibular | 25.7 (207) |
| Maxillary | 31.5 (253) |
| Erupted | |
| Mandibular | 12.9 (104) |
| Maxillary | 15.7 (126) |
| Unerupteda | |
| Soft tissue impaction | |
| Mandibular | 1.0 (8) |
| Maxillary | 2.1 (17) |
| Bony impaction | |
| Mandibular | 6.6 (53) |
| Maxillary | 4.5 (36) |
a
Total percentage unerupted, 14.2%.