title: Relationship of head circumference to length in the first 400 days of life: a mnemonic.
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).
mesh_terms: D001827:Body Height; D002508:Cephalometry; D002657:Child Development; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008433:Mathematics; D012886:Skull / Q000033:anatomy & histology / Q000254:growth & development; D013997:Time Factors