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| Factors | P value |
|---|---|
| Age | 0.28 |
| Sex | 0.06 |
| Smoking | 0.0004a) |
| Medical history | 0.88 |
| Location of the implant | 0.35 |
| Implant system | 0.21 |
| Implant diameter | 0.46 |
| Implant length | 0.57 |
a)Statistically significant difference in the cumulative survival rate of smokers and nonsmokers using Kaplan-Meier analysis with the log-rank test (P<0.05).
