Table 1 Characteristics of the study sample at baseline; mean ± standard deviation and %. (total number of participants n = 494; test n = 223 and control n = 271)
| Â | Test | Control |
|---|---|---|
No. of teeth | 25.9 ± 2.4 | 26.5 ± 2.0 |
Mean age | 54.8 ± 11.2 | 53.6 ± 12.4 |
Gender, % | ||
 Female | 45.3 | 44.6 |
 Male | 54.7 | 55.4 |
Education, % | ||
 Elementary school | 23.4 | 17.4 |
 High school | 47.7 | 47.8 |
 University | 28.8 | 34.8 |
Smoker, % | ||
 Current | 24.2 | 23.8 |
 Previous | 35.5 | 35.9 |
 Never | 40.3 | 40.2 |