Table 2.

Angiographic characteristics of the CTO according to lesion location

	Overall	Proximal	Mid	Distal	p
CTO length (mm)	34±24	43±28	28±18	26±16	<0.001
Vessel diameter (mm)	2.8±0.5	2.9±0.6	2.8±0.5	2.6±0.5	<0.001
Target vessel					<0.001
LAD (%)	23	19	33	9
LCX (%)	21	20	20	28
RCA (%)	56	61	47	63
Proximal cap ambiguity (%)	31	37	27	29	0.008
Side branch at proximal cap (%)	48	46	50	48	0.456
Blunt/No stump (%)	54	61	49	49	<0.001
Distal cap at bifurcation (%)	32	35	29	34	0.173
Poor distal target vessel (%)	38	37	35	47	0.021
Interventional collaterals (%)	58	64	53	56	0.005
Moderate/severe calcification (%)	55	64	47	49	<0.001
Moderate/severe tortuosity (%)	35	36	32	42	0.069
In-stent restenosis (%)	13	13	13	19	0.059
J-CTO score (%)	2.6±1.2	2.7±1.2	2.4±1.2	2.5±1.2	0.002

CTO: chronic total occlusion, LAD: left anterior descending, LCX: left circumflex, RCA: right coronary artery