TABLE 1.

Definitions of periodontal status according to the severity of periodontitis.

Periodontal status	Definition
Severe periodontitis	≥2 interproximal sites with AL ≥6 mm (not on same tooth) and ≥1 interproximal site with PD ≥5 mm
Moderate periodontitis	≥2 interproximal sites with AL ≥4 mm (not on same tooth), or ≥2 interproximal sites with PD ≥5 mm (not on same tooth)
Mild periodontitis	≥2 interproximal sites with AL ≥3 mm, and ≥2 interproximal sites with PD ≥4 mm (not on same tooth) or one site with PD ≥5 mm
Noperiodontitis	No evidence of mild, moderate, or severe periodontitis