Table 3. Various grading systems of coronary stenosis.

	Grading system
	SCCT guideline, 2014 [6]	SCCT guideline, 2009 [13]	Min et al., 2007 [22]	Hadamitzky et al., 2013 [29]
Normal	No stenosis	No stenosis	No stenosis
Minimal	< 25%		< 30% (very mild)
Mild	25%–49%	< 39%	30%–49%	1%–49%
Moderate	50%–69%	40%–69%	50%–69%	50%–69%
Severe	70%–99%	70%–99%	≥ 70%	≥ 70%
Occluded	Occluded	Occluded

SCCT = Society of Cardiovascular Computed Tomography