Table 3. Results of the multivariate logistic regression model predicting the success rates of periapical periodontitis following the root canal treatment.

Independent variables	Crude OR (95% CI)	Adjusted OR (95% CI)	aP-value
Treatment (Ref.: HFLC)	0.85 (0.32–2.29)	0.78 (0.23–2.66)	0.69
Gender (Ref.: Male)	0.84 (0.29–2.42)	0.49 (0.12–2.0)	0.32
Baseline PAI score (Ref.: 3)	-	-	-
PAI = 4	0.11 (0.02–0.55)	0.06 (0.01–0.39)	0.003
PAI = 5	0.13 (0.02–0.80)	0.09 (0.01–0.74)	0.025
bFilling Extension (Ref.: Ideal)	0.76 (0.26–2.24)	0.2 (0.01–5.99)	0.35
bFilling Taper (Ref.: Ideal)	0.64 (0.13–3.25)	0.22 (0.01–8.19)	0.41
bFilling quality (Ref.: Deficient)	-
Perfect	0.43 (0.05–3.85)	3 (0.04–236.4)	0.623
Satisfactory	0.38 (0.04–3.55)	0.42 (0.03–6.29)	0.527
Age (continuous variable)	0.99 (0.95–1.02)	0.96 (0.91–1.01)	0.11
Tooth position (Ref.: Maxilla)	1.02 (0.25–4.18)	0.21 (0.02–1.97)	0.14
Sinus tract (Ref.: Absent)	0.6 (0.19–1.84)	0.51 (0.14–1.94)	0.31

OR,Odds Ratio; CI, Confidence Interval; Ref., Reference; HFLC, Hand File, Lateral Compaction technique. PAI, Periapical Index Score.

^a Wald’s Test.

^b Criterions for root canal obturation quality parameters defined by a prior study [19] were adopted.