Table 3. Findings of the univariate and multivariate Cox regression analyses for early implant failure.
| Variable | Univariate regression | Multivariate regression* | ||
|---|---|---|---|---|
| cHR (95% CI) | P | aHR (95% CI) | P | |
| Female (reference: male) | 0.89 (0.44–1.81) | 0.752 | ||
| Age | 1.01 (0.98–1.05) | 0.462 | ||
| Mandible (reference: maxilla) | 1.99 (0.84–4.72) | 0.117 | 2.31 (1.12–4.76) | 0.023† |
| Posterior (reference: anterior) | 1.36 (0.32–5.78) | 0.677 | ||
| Resident surgeon (reference: faculty member) | 2.69 (1.27–5.71) | 0.001† | 2.86 (1.37–5.94) | 0.005† |
| 1-stage (reference: 2-stage) | 0.68 (0.33–1.40) | 0.293 | ||
| Implant diameter | 0.98 (0.44–2.21) | 0.966 | ||
| Implant length | 1.36 (0.93–1.99) | 0.108 | 1.33 (0.94–1.90) | 0.112 |
| SFE (reference: none) | 0.66 (0.19–2.36) | 0.527 | ||
| Preoperative GBR (reference: none) | 0.89 (0.27–2.94) | 0.849 | ||
| Simultaneous GBR (reference: none) | 0.63 (0.28–1.42) | 0.266 | ||
cHR: crude hazard ratio, aHR: adjusted hazard ratio, CI: confidence interval, GBR: guided bone regeneration, SFE: sinus-floor elevation.
*Wald test=18.53 for 3 degrees of freedom, P<0.001; †Significant difference.