Table 7 Dental erosion, tooth wear and TMD regressed on socio-demographic characteristics and statistically significant interactions
Variable | Dental erosion (Grade 1–3) | Tooth wear (Grade 1–4) | TMD (2Q/TMD > 0) | |||
|---|---|---|---|---|---|---|
OR (95% CI) | P | OR (95% CI) | P | OR (95% CI) | P | |
District | ||||||
 Monduli | 1 |  |  |  | 1 |  |
 Longido | 1.6 (0.9–3.2) | 0.140 |  |  | 0.2 (0.1–0.4) | < 0.001 |
Sex | ||||||
 Female |  |  |  |  | 1 |  |
 Male |  |  |  |  | 1.2 (0.7–2.2) | 0.483 |
Age group | ||||||
 12–14 years |  |  |  |  | 1 |  |
 15–17 years |  |  |  |  | 1.3 (0.8–2.2) | 0.251 |
Region of birth | ||||||
 Others | 1 |  | 1 |  |  |  |
 Arusha | 1.1 (0.5–2.3) | 0.897 | 1.3 (0.9–1.9) | 0.129 |  |  |
Ethnic groups | ||||||
 Maasai | 1 |  |  |  | 1 |  |
 Non maasai | 2.0 (1.3–3.2) | 0.003 |  |  | 1.6 (0.9–2.9) | 0.096 |
Wealth index | ||||||
 Most poor | 1 |  | 1 |  |  |  |
 Least poor | 0.9 (0.6–1.2) | 0.455 | 0.8 (0.7–1.1) | 0.157 |  |  |
Mother’s education | ||||||
 Low (≤ primary school) | 1 |  |  |  | 1 |  |
 High (≥ secondary school) | 2.3 (1.3–4.0) | 0.002 |  |  | 5.1 (2.5–10.2) | < 0.001 |
Ethnicity by district | ||||||
 Maasai x Monduli |  |  |  |  | 1 |  |
 Non Maasai x Longido |  |  |  |  | 3.4 (1.1–10.4) | 0.034 |