. Author manuscript; available in PMC: 2017 Nov 20.

Published in final edited form as: J Periodontol. 2009 Mar;80(3):436–446. doi: 10.1902/jop.2009.080480

Table 2.

Patient Demographics and Clinical Parameters Stratified by Level of Disease

	Group A (healthy)	Group B (gingivitis)	Group C (mild chronic periodontitis)	Group D (moderate to severe chronic periodontitis)	P Values Comparing A Through D		P Values Comparing A and B Versus C and D
	Group A (healthy)	Group B (gingivitis)	Group C (mild chronic periodontitis)	Group D (moderate to severe chronic periodontitis)	Overall	Trend	P Values Comparing A and B Versus C and D

Subjects (n)	18	32	28	21	NA	NA	NA
Males (%)	56	41	39	38	0.67	0.32	0.47
Whites (%)	78	78	68	86	0.54	0.80	0.78
Smokers (%)	0	19	36	81	<0.001	<0.001	<0.001
Mean number of teeth	28	27	26	25	<0.001	<0.001	<0.001
Mean age (years)	45	42	53	50	0.02	0.03	0.002
Sites with BOP (%)	12	31	52	64	<0.001	<0.001	<0.001
Sites with gingival redness (%)	13	22	49	56	<0.001	<0.001	<0.001
Sites with plaque (%)	24	26	57	61	<0.001	<0.001	<0.001
Mean PD (mm)	1.49	1.65	2.29	3.03	<0.001	<0.001	<0.001
Sites with PD >4 mm (%)	0	0	7	20	<0.001	<0.001	<0.001
Mean CAL (mm)	0.59	0.72	1.69	2.93	<0.001	<0.001	<0.001
Mean RBL (mm)	1.89	2.00	3.13	4.33	<0.001	<0.001	<0.001

NA = not applicable.