Quantification of coronary atherosclerosis as the number
of diseased coronary vessels at the time of a catheterization procedure. The variable describes the number (0–3) of vessels with significant (> 75%) blockage while taking into account the location of the vessels as well as the left or right dominance of the patient. The trait is coronary atherosclerosis measurement (Experimental Factor Ontology id EFO_0007938).