Abbreviation	Definition
ACE	Angiotensin-converting enzyme
ANCOVA	Analysis of covariance
ARB	Angiotensin II receptor blocker
ASA	Acetylsalicylic acid
CABG	Coronary artery bypass grafting
CCS	Canadian Cardiovascular Society
CI	Confidence interval
COPD	Chronic obstructive pulmonary disease
CTO	Chronic total occlusion
CTO-PCI	Percutaneous coronary intervention for chronic total occlusion
ESS	Effective sample size
IPTW	Inverse probability of treatment weighting
J-CTO	Multicenter CTO Registry of Japan score
LAD	Left anterior descending artery
LCX	Left circumflex artery
LVEF	Left ventricular ejection fraction
MACCE	Major adverse cardiac and cerebrovascular event
OMT	Optimal medical therapy
OR	Odds ratio
PCI	Percutaneous coronary intervention
pp	Percentage points
PS	Propensity score
QoL	Quality of life
RCA	Right coronary artery
SAQ	Seattle Angina Questionnaire
SAQ AF	Seattle Angina Questionnaire Angina Frequency domain
SD	Standard deviation
SMD	Standardized mean difference
TIMI	Thrombolysis in Myocardial Infarction