Table 3.

Comparison of IVUS findings between the slow flow and non-slow flow groups.

	All (n = 290)	Slow flow (n = 43)	Non-Slow Flow (n = 247)	p value
Number of analyzed frames, n	5316	1029	4287
IVUS before RA/ after RA, n (%)	164 (56.6)/126 (43.5)	14 (32.6)/29 (67.4)	150 (60.7)/97 (39.3)	0.0008
Mean affected area, mm2	0.44 (0.24–0.67) (n = 126)	0.45 (0.35–0.69) (n = 29)	0.42 (0.24–0.69) (n = 97)	0.47
Lesion length, mm	15 (8–26)	24 (12–36)	14 (7–24)	0.001
Maximum arc of calcification, °	360 (360–360)	360 (360–360)	360 (291–360)	0.02
Average of calcification-arc, °	244 (199–287)	246 (204–295)	242 (196–285)	0.33
Minimal lumen area, mm2	2.0 (1.6–2.6)	1.8 (1.5–2.3)	2.0 (1.6–2.7)	0.03
Mean diameter at minimal lumen, mm	1.6 (1.4–1.9)	1.5 (1.4–1.8)	1.6 (1.5–1.9)	0.06
Average of lumen area, mm2	3.5 (2.9–4.6)	3.4 (2.6–4.0)	3.5 (2.9–4.7)	0.12
Mean diameter, mm	2.1 (1.9–2.4)	2.1 (1.8–2.3)	2.1 (1.9–2.4)	0.14
Presence of calcified nodule, n (%)	123 (42.4)	16 (37.2)	107 (43.3)	0.51
Quadrant score of calcified nodule, n	0 (0–1)	0 (0–1)	0 (0–1)	0.45
Presence of reverberation, n (%)	246 (84.8)	42 (97.7)	204 (82.6)	0.01
Maximum quadrant of reverberation	2 (1–2)	2 (1–3)	1 (1–2)	0.003
Maximum number of reverberation	1 (1–2)	2 (1–2)	1 (1–2)	0.003
Arc of calcification at minimal lumen area, °	268 (206–360)	312 (226–360)	262 (204–333)	0.049
Quadrant score of calcified nodule at minimal lumen area, n	0 (0–0)	0 (0–0)	0 (0–0)	0.04
Quadrant score of reverberation at minimal lumen area, n	0 (0–1)	1 (0–1)	0 (0–1)	0.04
Number of reverberation at minimal lumen, n	0 (0–1)	1 (0–1)	0 (0–1)	0.04
The distance from IVUS to calcification at MLA, mm	0.59 (0.52–0.72)	0.57 (0.51–0.67)	0.60 (0.52–0.74)	0.11

Values are presented as median (interquartile range), or n (%) for categorical variables.

IVUS intravascular ultrasound.