Table 4.

Assignment and description of related factors affecting the occurrence of periodontitis in patients with type 2 diabetes mellitus

Factor	Assignment of value
Sex	Female = 0
	Male = 1
Age	Continuous variables
Brushing frequency	≥ 2 times/d = 0
	< 2 times/d = 1
Education level	Below high school education = 0
	High school education = 1
	Above high school education = 2
HbA1c	Continuous variables
TC	Continuous variables
TG	Continuous variables

HbA1c: Glycosylated hemoglobin; TC: Total cholesterol; TG: Triglyceride.