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Box plots of FAZ area (mm2) in different ETDRS grades of DMI: none, questionable, mild, moderate, and severe. The bottom of the box represents the 25th percentile, the top of the box represents the 75th percentile, and the line in the middle of the box represents the 50th percentile. The whiskers represent the highest and lowest values that are not outliers or extreme values. The asterisk beyond the whiskers represents an outlier or extreme value
