Centers for Disease Control and Prevention

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Overview of  the CDC Growth Charts

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Mean: an average computed by summing the values of observations and dividing by the number of observations. Example: the average of four children's aged 3, 7, 10, 12: 3 + 7 + 10 +12 = 32/4 = 8

Median: representative of the value in the middle. Example: The 50th percentile in a percentile ranking of 1 to 100.

Stature: also referred to as height.

Skewness: a measure of the tendency for the distribution of values to be more spread out on one side than the other. Example: Positive skewness indicates that values located to the right of the mean are more spread out than are values located to the left of the mean.

Z-score: in a standard normal distribution, the z-score represents the number of standard deviations away from the population mean. In other words, it indicates the degree to which an individual's measurement deviates from what is expected for that individual.