Fig. 1
From: Association between weight-adjusted waist index and severe periodontitis using NHANES 2009–2014
Flowchart of the sample selection from NHANES 2009–2014. A total of 30,468 participants were enrolled at first. After excluding participants missing the complete data about periodontitis examination (n = 19,784) and WWI (n = 377), 10,307 eligible participants were included in our final analysis.
