Table 2.

Identification of independent clinical and radiological factors predictive of ETE using multiple regression analysis.

Variable	OR	95% CI	P value
Age	1.0	0.98, 1.1	.34
Size	1.8	0.60, 5.2	.30
Surgery			.89
Subtotal thyroidectomy or lobectomy	Ref.
Total thyroidectomy	1.1	0.33, 3.6
Shape			.035
Wider than tall	Ref.
Taller than wide	3.4	1.1, 10.3
T stage on US			.001
T1 (absence of ETE)	Ref.
T3 (presence of ETE)	6.0	2.0, 17.7