Table 3. Comparison of perivascular FAI parameters with different study groups (TAK vs. control group, TAK-CAI vs. TAK-nonCAI, localised vs. diffuse groups, active vs. inactive inflammation groups).

Parameters (HU)	Control group1 (n=51)	TAK group2 (n=111)	TAK-nonCAI group3 (n=59)	TAK-CAI group4 (n=52)	Diffused group5 (n=27)	Localized group6 (n=25)	Active inflammation group7 (n=33)	Inactive inflammation group8 (n=78)	P value
									(1 vs. 2)	(1 vs. 3)	(4 vs. 3)	(5 vs. 6)	(7 vs. 8)
FAI	−90 [−94, −86]	−81 [−76, −74]	−84 [−88, −77]	−78 [−82.75, −69.75]	−74.00 [−80.00, −66.00]	−81 [−85.50, −75]	−77.50 [−72, −66]	−84 [−87, −79]	<0.001	<0.001	<0.001	0.005	<0.001
10th percentile	−138 [−144, −131]	−128 [−135, −115]	−132 [−142, −119]	−121 [−130, −106]	−111.00 [−123.00, −100.00]	−128 [−134, −116.50]	−109 [−120.50, −100]	−131.50 [−139.25, −123]	<0.001	0.005	<0.001	0.003	<0.001
90th percentile	−43 [−47, −42]	−39 [−41, −38]	−40 [−41.10, −38]	−39 [−41, −37]	−38.00 [−40.00, −37.00]	−39 [−42, −38]	−38 [−38.50, −36.50]	−40 [−42, −39]	<0.001	<0.001	0.020	0.023	<0.001
MEAN	−89.57 [−94.33, −86.09]	−80.75 [−85.76, −74.25]	−84.31 [−87.72, −77.39]	−78.04 [−82.49, −69.70]	−73.77 [−79.98, −65.59]	−80.75 [−85.56, −75.16]	−72.05 [−77.50, −66]	−84.15 [−86.99, −79.28]	<0.001	<0.001	<0.001	0.004	<0.001
MEDIAN	−88.07±5.95	−76.04±8.28	−78.83±7.33	−72.88±8.23	−69.88±7.96	−76.12±7.36	−67.66±6.17	−79.58±6.27	<0.001	<0.001	<0.001	0.004	<0.001

Data are presented as median [25%, 75%] or mean ± SD. FAI, fat attenuation index; TAK, Takayasu arteritis; CAI, coronary artery involvement.