PEDIATRICS Vol. 67 No. 4 April 1981, pp. 506-507
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Relationship of Head Circumference to Length in the First 400 Days of Life: A Mnemonic

Mark S. Dine MD1, Peter S. Gartside PhD1, Charles J. Glueck MD1, Larry Rheins BA1, Gail Greene BA1, and Phillip Khoury BS1

1 Lipid Research and General Clinical Research Centers, and Departments of Pediatrics, Medicine, and Biostatistics-Epidemiology, University of Cincinnati College of Medicine, Cincinnati

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).

Submitted on June 2, 1980
Accepted on August 4, 1980