Table 4.

Univariate and multivariate analyses of the effects of preoperative conditions on the quality of root canal treatment

	Comparison group	Reference group	Univariate analysis		Multivariate analysis
			OR (95% CI)	P-value	OR (95% CI)	P-value
Obturation length	One condition	None	0.47 (0.28, 0.80)	<0.0066 a	0.98 (0.53, 1.80)	<0.3536
	Two or more	None	0.46 (0.23, 0.90)		0.57 (0.25, 1.27)
	Two or more	One condition	1.02 (0.56, 1.87)		1.72 (0.83, 3.55)
Obturation density	One condition	None	0.55 (0.27, 1.12)	0.0160 a	0.78 (0.34, 1.81)	0.2566
	Two or more	None	1.43 (0.44, 4.62)		1.53 (0.42, 5.55)
	Two or more	One condition	0.38 (0.16, 0.94)		0.51 (0.20, 1.31)
Mishaps	One condition	None	0.29 (0.19, 0.50)	<0.0001 a	0.61 (0.37, 0.99)	<0.0443 a
	Two or more	None	0.27 (0.13, 0.54)		0.32 (0.14, 0.75)
	Two or more	One condition	1.10 (0.62, 1,94)		1.87 (0.97, 3.63)
Preparation taper	One condition	None	0.89 (0.48, 1.65)	0.8605	1.01 (0.54, 1.90)	0.9978
	Two or more	None	1.06 (0.50, 2.24)		0.99 (0.47, 2.10)
	Two or more	One condition	0.84 (0.42, 1.65)		1.03 (0.49, 2.14)

a. Statistically significant at P 0.05; P-value based on the Wald chi-squared test; OR=odds ratio