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Table 4 Distribution of study participants by periodontitis presence, stage, grade, and extent (N = 454)

From: Periodontal conditions in a 65-year-old population and prevalence of periodontitis according to three different bone level thresholds

  Non-periodontitis cases Stage I Stage II Stage III Stage IV
n (%) n (%) n (%) n (%) n (%)
Total 215 (47.4) 0 (0) 75 (16.5) 149 (32.8) 15 (3.3)
Grade A
Localized 0 (0) 0 (0) 0 (0) 0 (0)
Generalized 0 (0) 0 (0) 0 (0) 0 (0)
Grade B
Localized 0 (0) 5 (1.1) 121 (26.7) 0 (0)
Generalized 0 (0) 68 (15.0) 3 (0.7) 6 (1.3)
Grade C
Localized 0 (0) 0 (0) 17 (3.8) 0 (0)
Generalized 0 (0) 2 (0.4) 8 (1.8) 9 (2.0)
  1. Localized; < 30% of teeth involved. Generalized; ≥ 30% of teeth involved