Table 3. Summary of results of previous studies evaluating role of PSV-STA in differentiation of Graves’ disease and thyroiditis.

Study	Country	Graves’ disease	Thyroiditis	PSV-STA cut-off (cm/sec)	Sensitivity (%)	Specificity (%)
Abbreviations: PSV, peak systolic velocity; STA, superior thyroid artery.
Uchida et al 8	Japan	44	13	45	83.7	92.3
Chen et al 11	China	168	52	45.25	80.4	81.4
Zhao et al 10	China	118	51	50.5	81.04	96.08
Kim et al 12	Korea	40	20	41.3	95	85
Hiraiwa et al 13	Japan	68	33	43	87	100
Karakas et al 9	Turkey	17	7	87	100	100
Present study	India	82	29	54.3	82.9	86.2