Thyroid blood flow in inferior thyroid artery as predictor for increase in levothyroxine dosage during pregnancy in women with Hashimoto's thyroiditis - a retrospective study

Table 2 ITA-PSV and TSH independently associated with increase in LT4

	Model 1		Model 2		Model 3		Model 4		Model 5
Variables	β	p	β	p	β	p	β	p	β	p
TSH	0.507	0.008	0.652	0.001	0.647	0.001	0.646	0.002	0.526	0.010
ITA-PSV	− 0.362	0.047
F-T4			−0.194	0.268
F-T3					−0.187	0.287
Baseline LT4 administration (yes = 1, no = 0)							0.100	0.573
Thyroid volume									−0.277	0.146
adjusted r²/p	0.475/0.001		0.392/0.003		0.389/0.004		0.361/0.005		0.420/0.002

Standardized partial regression coefficient values (β values) and level of significance are shown
R²: coefficient of determination
Abbreviations: TSH Thyroid stimulating hormone, ITA-PSV Inferior thyroid artery peak systolic velocity, F-T4 Free thyroxine, F-T3 Free triiodothyronine, LT4 Levothyroxine

ISSN: 1471-2393