Table 4. Univariate predictors amongst clinical and lesion-related variables in the “derivation” data set.

Variables		OR	95% CI	β coefficient	p-value
Age (years)		1.03	0.99-1.06	0.03	0.07
Male sex		2.38	0.69-8.12	0.87	0.17
Diabetes		0.92	0.47-1.81	–0.09	0.80
Hypertension		1.25	0.68-2.29	0.22	0.48
Smoking		1.23	0.67-2.28	0.21	0.50
Presenting problem (ref: CSA)	ACS	0.53	0.25-1.11	–0.63	0.09
	MI	0.31	0.11-0.93	–1.17	0.036
	Duration (ref: <1 year) ≥1 year	1.68	0.89-3.15	0.52	0.109
Lesion (ref: LAD)	RCA	1.35	0.69-2.64	0.29	0.386
	LCx	0.97	0.39-2.4	–0.03	0.947
LVEF fraction (ref: >50%)	30-50%	1.31	0.56-3.08	0.27	0.535
	<30%	0.59	0.13-2.68	–0.52	0.498
Proximal cap blunt		8.30	4.14-16.66	2.12	<0.001
Side branch present		2.68	1.41-5.09	0.99	0.003
Bridging collaterals present		1.62	0.71-3.69	0.48	0.249
Length of occlusion >20 mm		5.51	2.69-11.31	1.71	<0.001
Calcification present		2.05	1.10-3.82	0.72	0.024
Tortuosity present		2.89	1.55-5.41	1.06	<0.001
Ostial present		2.60	1.17-5.76	0.96	0.019
Antegrade trickle present		4.55	1.96-10.54	–1.5	<0.001
Rentrop grade <2		4.55	1.38-5.98	1.06	0.005
In-stent		0.58	0.07-4.74	–0.55	0.61
Previous attempt		1.48	0.46-4.76	0.39	0.506
ACS: acute coronary syndrome; CI: confidence interval; CSA: chronic stable angina; LCx: left circumflex artery; LVEF: left ventricular ejection fraction; MI: myocardial infarction; OR: odds ratio; RCA: right coronary artery