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Figure 1 Box and whisker plots illustrate the median and interquartile ranges of osteoprotegerin (OPG) in patients with minimal, mild, moderate, severe, and extensive coronary calcification respectively. Open circles show outliers (values between 1.5 and 3 box lengths from the upper edge of the box) and asterisks show extreme outliers (values >3 box lengths from the upper edge of the box).