Table 2.

Patient characteristics.

Patient Characteristics		Patients with Periodontitis N = 13	Healthy Dental Student Controls N = 13
Age (in years)	Mean ± standard deviation	52 ± 10	25 ± 4
Gender n (%)	Male	10 (77%)	3 (23%)
	Female	3 (23%)	10 (77%)
Systemic status n (%)	Healthy	7 (54%)	13 (100%)
	Cardiovascular diseases	1 (8%)	0 (0%)
	Hypertension	5 (38%)	0 (0%)
	Hypercholesterolemia	2 (16%)	0 (0%)
	Type I diabetes	1 (8%)	0 (0%)
	Asthma	1 (8%)	0 (0%)
Smoking n (%)	Yes *	3 (23%)	0 (0%)
	No	6 (46%)	13 (100%)
	Ex-smoker ˆ	4 (31%)	0 (0%)

*: All smoked 20–40 cigarettes per day. ˆ: All had stopped more than 2 years ago.