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Table 2 Characteristics of the study population

From: Correlations between clinical parameters in implant maintenance patients: analysis among healthy and history-of-periodontitis groups

  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) **
  1. n.s. not significant, *p < 0.05, **p < 0.01