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Relationship of Head Circumference to Length in the First 400 Days of Life: A Mnemonic

Mark S. Dine, Peter S. Gartside, Charles J. Glueck, Larry Rheins, Gail Greene, Phillip Khoury

Abstract

The relationship between length and head circumference can be expressed by the simplified formula: head circumference (centimeters) = 0.5 length +9.5 +/- 2.5; head circumference (inches) = 0.5 length + 3.75 +/- 1. This formula is accurate for 95% of measurements in the first 400 days of life. The correlation coefficient of length to head circumference is .94 (P = .0001).

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Key concepts: Circumference, Medicine, Head circumference, Head (geology), Centimeter, Anatomy, Surgery, Geometry