Table 3.
Multivariable Marginal Proportional Hazards Model of Tooth Loss (N = 18,798 Teeth)
| Independent variable | Level | P-value | Hazard ratio (95% CI) † |
|---|---|---|---|
|
Endodontic involvement (Time-dependent, tooth-level variables)
| |||
| RCT status | Yes | 0.005 | 1.39 (1.10, 1.74) |
| No* | |||
|
| |||
| AR status | ≥ 4 mm | <0.0001 | 6.95 (5.44, 8.88) |
| 1- 3 mm | <0.0001 | 4.11 (2.80, 6.03) | |
| No* | |||
|
| |||
|
Tooth-level covariates
| |||
| Tooth type | Molar | <0.0001 | 1.65 (1.35, 2.01) |
| Premolar | 0.109 | 1.15 (0.97, 1.36) | |
| Anterior* | |||
|
| |||
| No. of proximal contacts at baseline |
0 | 0.029 | 1.26 (1.02, 1.55) |
| 1 | 0.026 | 1.18 (1.02, 1.35) | |
| 2* | |||
|
| |||
|
Person-level covariates
| |||
| No. of teeth at baseline | Continuous | <0.0001 | 0.94 (0.92, 0.96) |
|
| |||
| Age at baseline (years old) | Continuous | 0.017 | 1.02 (1.00, 1.03) |
|
| |||
| Education at baseline | High school or less | <0.0001 | 1.75 (1.35, 2.27) |
| Some college | 0.010 | 1.37 (1.08, 1.74) | |
| College graduate* | |||
*
Reference group.
†
Adjusted for baseline values of coronal caries, alveolar bone loss, gingival bleeding, tooth mobility, plaque score, probing pocket depth and smoking history.