Table 5. Cases with periodontitis and percentage of the age cohort, as estimated by the case definition determined a priori, and using the post hoc case definition 2, based on having a minimum of three teeth with 5 mm attachment loss.

Age group	Number of affected individuals	Number affected by case definition 2
Under 25	2 (5.5%)	2 (5.5%)
25-34	4 (5.3%)	4 (5.3%)
35-44	4 (6.2%)	5 (7.7%)
45-54	3 (4.0%)	4 (5.4%)
55-64	2 (5.9%)	3 (8.8%)
Over 65	2 (10.5%)	2 (10.5%)