CDC/NCHS Infant Head Circumference for Age Percentiles (<36 months)

Calculate Z-score and percentile

CDC/NCHS Infant Head Circumference for Age Percentiles (<36 months)

Calculate Z-score and percentile

CDC/NCHS Infant Head Circumference for Age Percentiles (<36 months)

Calculate Z-score and percentile

CDC/NCHS Infant Head Circumference for Age Percentiles (<36 months)

Calculate Z-score and percentile

1.Sex
2.Age
3.Head Circumference
Created by on 08/09/2019

By using this site you acknowledge that you have read, understand, and agree to be bound by our terms of use and privacy policy. All content and tools are for educational use only, are not meant to be a substitute for professional advice and should not be used for medical diagnosis and/or medical treatment.

About this Calculator

This tool is based on data from the Centers for Disease Control (CDC) Growth Charts released in 2000. The CDC growth charts are recommended for use in clinical practice and research to assess size and growth in U.S. infants, children, and adolescents.

  • Microcephaly is a Head Circumference greater than two standard deviations below the mean.
  • Macrocephaly is a Head Circumference greater than two standard deviations above the mean.
  • At the extremes (>97th percentile or <3rd percentile), small differences in percentiles represent clinically important differences in head circumference. At these extremes, the z-score is a more precise reflection of how far the measurement deviates from the mean, and is a useful tool for tracking changes.

References

  • 1. Percentile conversion from Z-Score is done by table look-up in the standard Normal Table. Percentiles are provided for Z Scores between -3.09 and 3.09. Values beyond these extremes return percentiles of 0.1 and 99.9 respectively.
  • 2. LMS Parameters for Girls: Head Circumference for Age. National health and nutrition survey (NHANES), CDC/National Center for Health Statistics.
  • 3. LMS Parameters for Boys: Head Circumference for Age. National health and nutrition survey (NHANES), CDC/National Center for Health Statistics.

References

1. Sex

Created by on 08/09/2019

By using this site you acknowledge that you have read, understand, and agree to be bound by our terms of use and privacy policy. All content and tools are for educational use only, are not meant to be a substitute for professional advice and should not be used for medical diagnosis and/or medical treatment.

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