Table 1.

Results of multiple linear regression analysis evaluating factors that might influence species proportions in supragingival biofilms.

Outcome variable	Coefficient	p value
% A. actinomycetemcomitans	1.3673
	+ 0.0031 total DNA probe count	< 0.001
% P. gingivalis	2.3181
	− 0.0025 total DNA probe count	< 0.05
	− 0.3685 cuurent smoker	< 0.05
% C. rectus	1.0426
	+ 0.0035 total DNA probe count	< 0.0001
% C. gingivalis	1.4117
	+ 0.0135 total DNA probe count	< 0.0001
	+ 1.3796 upper molar	< 0.0001
	+ 0.7099 lower incisor/canine	< 0.001
	− 0.4374 male	< 0.01
	+ 0.0121 age	< 0.05
% S. sanguinis	2.0836
	+ 0.8578 lower incisor/canine	< 0.0001
	− 0.3910 periodontitis	< 0.0001
	− 0.0018 total DNA probe count	< 0.01
	− 0.0084 age	< 0.01
	− 0.1911 upper bicuspid	< 0.05
% A. naeslundii genospecies 2	10.0828
	− 0.0320 total DNA probe count	< 0.0001
	+ 1.8615 upper incisor/canine	< 0.001
	+ 1.6835 current smoker	< 0.001
	+ 1.2168 male	< 0.001
	− 1.1222 lower molar	< 0.05