Fig. 2From: The mediating roles of the oral microbiome in saliva and subgingival sites between e-cigarette smoking and gingival inflammationThe effects of EC smoking and other covariates (age, gender, and the frequency of brushing teeth) on gingival inflammation. *EC Smoking represents our major finding on the effect of EC smoking on gingival inflammation while adjusting for age, gender, and the frequency of brushing teeth. Age, Gender, and Freq. Brushing Teeth represent the effects of age, gender, and the frequency of brushing teeth, respectivelyBack to article page