Table 2 Characteristics of the study population
H group mean ± SD, or n (median) | HP group mean ± SD, or n (median) | Significant difference between H and HP group | |
|---|---|---|---|
Age | 56.0 ± 11.8 (57.9) | 67.2 ± 7.7 (66.9) | ** |
Number of teeth (at the first visit) (at the beginning of implant treatment) | 25.3 ± 3.0 (26.5) | 25.2 ± 2.9 (26.0) | n.s. |
23.9 ± 3.6 (25.0) | 21.6 ± 4.7 (23.0) | * | |
Number of extracted teeth | 1.6 ± 1.2 (1.0) | 4.1 ± 4.0 (2.0) | ** |
Maintenance period | 4 years 3 months (5 years 8 months) | 7 years 4 months (8 years 4 months) | ** |