TABLE 1.

Clinical study population demographics

Variable	Value(s) for group		P value
	Healthy subjects	Chronic periodontitis patients
No. male/female	6/18	26/23	<0.05
Mean age ± SD (yr)	43.3 ± 17.7	57.6 ± 12.4	<0.01
No. white/black/Asian/Hispanic	16/6/1/1	28/17/1/3	>0.05
Mean probing depth ± SD (mm)	2.38 ± 0.72	4.88 ± 2.31	<0.001
Mean attachment loss ± SD (mm)	1.02 ± 1.10	5.56 ± 2.88	<0.001