Table 2.

Results from univariable logistic regression models to predict the presence of root resorption.

	Odds ratio (95% CI)	P-value	AUC (95% CI)
Age (years)	1.019 (0.983–1.057)	0.2969	0.595 (0.539–0.651)
Female versus male	0.524 (0.338–0.814)	0.0040	0.574 (0.526–0.623)
Resorbed root for primary maxillary canine	1.012 (0.662–1.546)	0.9578	0.501 (0.451–0.551)
Crowding in the upper anterior region	0.598 (0.364–0.983)	0.0425	0.547 (0.504–0.590)
Optimal apical area	0.933 (0.616–1.415)	0.7449	0.508 (0.457–0.560)
Sufficient MD space	1.054 (0.695–1.598)	0.8057	0.506 (0.455–0.557)
Canine location		0.1460	0.555 (0.501–0.609)
Buccally	0.967 (0.710–1.316)	0.8302
Line of the arch	0.787 (0.555–1.117)	0.1803
Canine magnification	2.412 (1.558–3.735)	<0.0001	0.604 (0.555–0.653)
Open canine apex	0.302 (0.193–0.471)	<0.0001	0.641 (0.593–0.689)
Type of impaction (Horizontal versus vertical)	1.727 (1.041–2.867)	0.0345	0.544 (0.501–0.586)
Complete canine development	2.722 (1.629–4.547)	0.0001	0.593 (0.551–0.636)
Detection of abnormality	1.322 (0.829–2.110)	0.2413	0.527 (0.481–0.572)
Canine angulation to the midline	1.025 (1.014–1.037)	<0.0001	0.657 (0.601–0.714)
Canine angulation to the occlusal plane	1.020 (1.009–1.032)	0.0004	0.610 (0.551–0.669)
Canine angulation to the lateral incisor	0.975 (0.964–0.986)	<0.0001	0.644 (0.587–0.701)
Vertical canine crown position		0.0025	0.595 (0.541–0.649)
Above middle third	1.693 (1.255–2.284)	0.0006
In the middle third	0.887 (0.665–1.184)	0.4172
Canine overlap distal to the lateral incisor or below	0.365 (0.237–0.564)	<0.0001	0.621 (0.572–0.670)

AUC, area under the curve; CI, confidence interval.