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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)