From: Smoking and tooth discolouration: findings from a national cross-sectional study
Sex | Male | 1500 (44.3%) |
---|---|---|
 | Female | 1884 (55.7%) |
Age | 16–34 | 957 (28.3%) |
 | 35–54 | 1214 (35.9%) |
 | 55+ | 1213 (35.8%) |
Education | High education | 748 (22.1%) |
 | Middle education | 1304 (38.5%) |
 | Lower education | 1332 (39.4) |
Income | Average or higher than national average | 1046 (30.9%) |
 | Lower than average | 2338 (69.1%) |
Smoking | Smoker | 817 (24.1%) |
 | Non smoker | 2567 (75.9%) |