Table 3. Univariate logistic regression to investigate factors associated with treatment failure.

Parameter	OR	95% CI	p
T4 at diagnosis	0.99	0.98–1.00	0.059
Method (fixed vs. score)	1.89	0.65–5.5	0.23
Dose 131I	1.00	0.99–1.02	0.72
T4:131I ratio	0.48	0.15–1.52	0.2

All values refer to the association of each variable with euthyroidism after therapy.