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  • Title: Relationship of head circumference to length in the first 400 days of life: a mnemonic.
    Author: Dine MS, Gartside PS, Glueck CJ, Rheins L, Greene G, Khoury P.
    Journal: Pediatrics; 1981 Apr; 67(4):506-7. PubMed ID: 7254972.
    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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