Table 1.

Multivariate logistic regression analysis of factors potentially predictive of false-negative ultrasound results for ureterolithiasis (n = 201).

Independent variables	P-value	OR (95% CI)
Age (each year)	0.821	1 (0.97-1.04)
BMI (each unit)	0.007*	5 (1.04-1.28)
Ureterolithiasis laterality (left vs. right)	0.785	1.12 (0.5-2.48)
Gender (female vs. male)	0.589	1.28 (0.53-3.08)
Calculus diameter
(< 0.5 cm vs. 0.5-0.7 cm)	< 0.001*	3.54 (1.53-8.21)
(> 0.7 cm vs. 0.5-0.7 cm)	0.002*	0.19 (0.04-0.8)
Calculus location
(UPJ vs. distal)	0.663	1.04 (0.11-10.24)
(Proximal vs. distal)	0.018*	4.56 (1.47-14.18)
(Mid-ureter vs. distal)	0.058	3.75 (1.24-11.34)
(UVJ vs. distal)	0.011*	0.5 (0.19-1.35)

OR, odds ratio; CI, confidence interval.