Table 1.

Diversity of Gram-positive bacteria cultured in the saliva collected from 90 consecutive disease-free individuals comprised of 19 tobacco smokers and 71 non-smokers.

Sample category	Sample number	The mean bacterial species by sample category	Standard deviation
Total sample	90	2.01	1.15
Smoker	19	1.47	1.07
Non-smoker	71	2.15	1.13