Table 3. Reproducibility of automatic calcium scoring versus manual, and interscan reproducibility of automatic scoring, on breast planning CT.

	Categorical a		Continuous
	Linearly weighted kappa (95% CI)	Proportion of agreement (95% CI)	Intraclass correlation coefficient of calcium (Agatston) scores (95% CI)
Automatic vs. manual (n = 163)	0.80 (0.74–0.87)	0.79 (0.72–0.85)	0.86 (0.81–0.89)
Breath-hold (n = 58)	0.86 (0.77–0.96)	0.88 (0.76–0.95)	0.95 (0.91–0.97)
Without breath-hold (n = 105)	0.77 (0.68–0.85)	0.74 (0.65–0.82)	0.66 (0.54–0.76)
Automatic vs. automatic(n = 294)	0.61 (0.50–0.72)	0.84 (0.80–0.89)	0.34 (0.23–0.44)

Abbreviations: CAC = coronary artery calcium; CI = Confidence Interval

^a Cardiovascular risk categories of coronary artery calcium based on Agatston score: 0, 1–10, 11–100, 101–400, > 400