Table 1. Demographic and periodontal clinical features of the sample population.

	Background data
Age (mean, range)	54 (38–75)
Gender (M/F)	11/7
Smoking status (Y/N)	10/8
PPD (mean, range)*	7 (5–10)
CAL (mean, range)*	8 (5–14)
Number of teeth with PPD≥5 mm + BOP**	14 (7–27)
% teeth with PPD≥5 mm + BOP**	53 (25–96)

* PPD and CAL measured in mm and expressed as mean and range from sites sampled (n = 3) from each subject.

** Teeth with PPD≥5 mm+BOP expressed as mean and range based on full mouth registration.