The Effects of Smoking on Expression of IL-12 and IL-1β in Gingival Tissues of Patients with Chronic Periodontitis

Table 1: Comparison of Mean IL-1β between Smokers and Nonsmokers based on Periodontal Status (Healthy and Periodontitis).

Group	Smoking	N	Mean	SD*	Test Result
Healthy	No	11	718.73	840.75	Z=-.211 P=0.833
	Yes	10	628.60	2627.32
	Sum^	21	1675.81	3729.83
Periodontitis	No	10	3376.00	3851.11	Z=-2.948 P=0.003
	Yes	10	596.40	416.12
	Sum	20	1986.2	3023.32
Total Population	No	21	1984.09	2979.39	Z=-1.747 P=0.081
	Yes	20	612.50	518.36
	Sum	41	1315.02	2246.73

*SD: Standard deviation
^ Sum: total