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Figure 2 (A) Correlation between maximum percent diameter stenosis by quantitative analysis of multislice computed tomography (MSCT) compared with quantitative coronary angiography (QCA). The Spearman correlation showed an R value of 0.76, p < 0.0001, n = 130. (B) Bland-Altman analysis of the differences of percent diameter stenosis measured by MSCT and QCA compared to the average percent diameter stenosis by the two methods. The mean difference was 1.3 ± 14.2% (central line). A total of 94% (122 of 130) of the values lie within 1.96 SDs of the mean (outer lines). A total of 92% (119 of 130) of the observations were within one qualitative stenosis score (25%) of the mean difference. There was no significant correlation between stenosis difference and stenosis severity (Spearman correlation coefficient = –0.07, p = 0.59).