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Table 5 Periodontal stages distributed by different interproximal radiographic bone loss cutoffs (N = 454)

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

RBL (mm) Non-periodontitis cases n (%) Periodontitis cases n (%) Stage I n (%) Stage II n (%) Stage III n (%) Stage IV n (%)
 > 1 2 (0.4) 452 (99.6) 2 (0.4) 243 (53.5) 191 (42.1) 16 (3.5)
 > 2 37 (8.1) 417 (91.9) 0 (0) 212 (46.7) 189 (41.6) 16 (3.5)
 > 3 215 (47.4) 239 (52.6) 0 (0) 75 (16.5) 149 (32.8) 15 (3.3)