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Distribution of differences (laboratory value − label value) for (a) sodium and (b) calories.
* The data are presented as frequency distributions in bar graphs and box plots. In the box plots, the median is represented by a vertical line, the mean is denoted by a diamond shape, and the first and third quartile are the represented by the sides of the box. The extreme differences are represented by individual data points extending beyond the whiskers (1.5 IQR).
