The Centers for Disease Control and Prevention 1 and the World Health Organization2 have published growth curves derived from the z scores of cross-sectional data in children3,4 who have become an integral part of pediatrics. Children whose growth curves fall below these curves are said to have failure to thrive. Growth curves may be useful to determine whether a patient’s values are within a normal range, but they do not capture the longitudinal perspective essential for determination of health. We followed up patients longitudinally using a large outpatient electronic medical record to determine changes in weight percentile during their first year of life.
Positive numbers indicate an increase in percentile lines while negative numbers indicate a decrease in percentile lines.
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