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What Makes a Good Growth Chart?

Owen and Garn, in their recent editorial,1 extensively discuss the nature of the data used to derive the norms or standards used on the growth chart, but they dismiss the format of the chart with only a few words. I would argue that for usefulness in the health care of children the format of the chart is much more important than the data used to derive the standards.
 What is it that the clinician expects, or should expect, to learn from measurements plotted on a chart?