Table 3. Comparison of colloid nodule size among various flow patterns (Kruskal-Wallis test).

Vascular flow pattern	Number	Mean (cm)	Std Dev	Min (cm)	Median (cm)	Max (cm)	P value
Absent	30	2.70667	2.31858	0.8	1.7	9.8	0.98
Perinodular only	30	2.16	1.20447	0.5	2.05	5.8
Intranodular only	58	2.36379	1.56078	0.6	2	7.3
Diffuse	14	2.24286	1.19016	1.1	2.05	5
Both intranodular and perinodular	68	2.16324	1.26502	0.6	1.8	6.7