Table 4.

Assignment of variables for logistic regression analysis.

Variable	Definition	Assignment
X1	Age	1 = >75 years, 2 = ≤75 years
X2	Oral hygiene	1 = periodontitis, 2 = non-periodontitis
X3	Anesthesia	1 = block, 2 = infiltration
X4	Number of tooth	1 = ≥4, 2 = <4
Y	Bleeding	1 = bleeding, 2 = no bleeding